In an OTB rating game --> like others only when I (think) see clear compensation. Although,...when I see an unclear sacrifice, I always have to keep telling myself to not do it, because I want to improve/because of the team, etc. Because it is just so much fun to play such a move! 
In a (OTB) rapid/blitz game --> Sure its fun! 
But yeah Tal was really superb.. He play unsual style of games and go 4 sacrifice more often
Well a good sacrifice in a chess is something which make the game glorious and give it a beauty. It is something which is not common to everyone and every game, in very rare case it occurs.
I remember the Quote of M.Tal- there are only two types of sacrifice!! A good sacrifice and the other one is mine!!!
So my question is- did you ever dare to sacrifice in your chess game?.
Sacrifices aren't the only beauty in Chess, but are one aspect. Though yes, I sacrifice, but don't be afraid to calculate all the forcing moves first, and don't be afraid of the web of tactical complications (i.e., so many different recaptures in the tree of analysis). As a fine tactician myself I look for such moves, though they aren't always viable.
Willing to sacrifice?
I never take advice. Some day, I'll pay the price, I know.
I know that.
Sacrifices aren't the only beauty in Chess, but are one aspect. Though yes, I sacrifice, but don't be afraid to calculate all the forcing moves first, and don't be afraid of the web of tactical complications (i.e., so many different recaptures in the tree of analysis). As a fine tactician myself I look for such moves, though they aren't always viable.
And above all, don't be afraid to NOT play an unsound sacrifice, even if you spent ten minutes checking the lines. It won't impress your opponent, chess is not poker.
I will sack a rook for a minor piece a couple of pawns. Usually to break down my opponents kings safety or threaten mate or pressure.
I think the right question could be: did you ever dare to do an intuitive sacrifice? (When you dont see what will exactly happen) When you exactly see the result of the sacrifice, it is easy to do that.
Whose game is this?
Sacrifices aren't the only beauty in Chess, but are one aspect. Though yes, I sacrifice, but don't be afraid to calculate all the forcing moves first, and don't be afraid of the web of tactical complications (i.e., so many different recaptures in the tree of analysis). As a fine tactician myself I look for such moves, though they aren't always viable.
And above all, don't be afraid to NOT play an unsound sacrifice, even if you spent ten minutes checking the lines. It won't impress your opponent, chess is not poker.
You don't have to tell me =) I remember studying a Bronstein game where Bronstein played an unsound sacrifice, which the opponent underestimated and black went on to win.
I'll upload the game here, but it's computer analysed for accuracy so some of the verbal annotations may seem strange:
In any event it was a crazy game to look at, though I have my own annotations before computer checking in a Word document. Since I had the notation pane off I didn't quite see just how long the game would be lol!
Also, the computer didn't spit out a logical line as black clearly wanted 32...Rc2 33.Rc1,Rxa2 34.Rxc8+,Kh7 35.Rxa2 with two rooks for the queen and a rook on the seventh, not to mention an extra minor piece as well.
Well thanks for posting this.. Yeah we should never underestimate..
I play the Colle so a bishop or knight sacrifice on f7 or g6 or h6 is thematic. I have happy memories of a match game for my club in which my opponent's body language was uneasy throughout the opening. I had been eying a knight sac on f7 for some time and sure enough the opportunity came along. The thing that made it memorable is that exactly on the move that allowed the sac my opponent's body language changed and he suddenly looked much happier - almost smug. This made springing the surprise particularly satisfying.
But generally, no, like other posters I only sacrifice when I can see a clear forcing line. In a current vote chess game a much stronger player than I advocated a pawn sac for purely positional gain and I argued against it (on no better basis than that a pawn is a pawn is a pawn). The pawn sac won the vote and now I am interested to see how the positional aspects work out. But I would not even have seen the move myself, let alone played it.
I do sacrafices all the time! They make me look styleish 
otb 2hours game I was down material and was about to resign as I tried a last attempt. I sacrificed my rook in order to set a trap.
my opponent who was rated 400 points higher than me didn't see the trap and took it. only to find mate in two. it was published in our local chess newspaper.
it was still a sacrifice since he could have played another variation and take the rook for free. however he sensed no danger.
Whose game is this?
Mine. I made a mistake on move 14... 14. Be3 wins far more quickly.
It was the 15. ... gxf5 16. Qg4+ sub-variation that really made the game for me. Unfortunately, my opponent took with the Bishop instead of with the Pawn.
A friend of mine posted this today.
http://www.chess.com/forum/view/game-analysis/miniature-with-sacrifices
otb 2hours game I was down material and was about to resign as I tried a last attempt. I sacrificed my rook in order to set a trap.
my opponent who was rated 400 points higher than me didn't see the trap and took it. only to find mate in two. it was published in our local chess newspaper.
it was still a sacrifice since he could have played another variation and take the rook for free. however he sensed no danger.
Good job! That's awesome 
h2 after 0-0. Q,n.in the area ,rook at e1. Here comes bxp+. More often then not i can draw,The sac. fails as g6 and f3/4 provide flight squares. Luv that attack!