Worst opening move by white?

What do you think is fhe WORST first move white can make?

a3, a4, h3 and h4 are pretty lame, but I think the cake goes to the grob.  (g4)  as, checkmate can happen in just one more bad move.  Some people LOVE the grob... chess is a mystery!

1f3 is pretty horrible too.

The Grob is actually not that bad.
Gives equality with best play, while some openings give black a better game lol.

Oh, everyone must come to their own conclusion about the grob.  The fact is the stats are skewed because of a few players who surprise the pants off everyone and are so well prepared to hold the defence, that it gets a positive score.  The sampling of games where the grob is played is small, because most people can see it's suicide.  I've had some lovely OTB mates with it, but it's still pretty clubhouse. 

Putting knight on h3 seems to be pointless.

Also, f3 is very dangerous if we don't know what we are going to do next.

ok it seems to me Nh3is the worst(white is misplacing a knight ) especially when castled kingside.

Yes, but at least white is developing a piece with 1.Nh3, and that piece is controlling squares in in the "large" center, while not blocking other normal developmental moves... It's absolutely not the best move, but it has SOME small merit over the pawn moves discussed...

I think it's hard to judge game basing on one single move, the rest depends on other moves and what the player wants to do. For example: sicilian defense can be useless if the player can't make advantage (or equality) from it. For me the opening is a sequence of moves and the first move has to allow plan realisation in accordance with the fixed goals.

Statistically for the chess engines f3 is the worst move (gives score about -0.50).

Bonus ;).