Some cool Tactics that you can solve

I was in a chess camp which was taught by a GM (don't ask me his name since I forgot it) and he showed us lots of tactics that were fairly interesting. I wanted to show you a few of them. 

In all positions, it is white to move. It took me some time to solve them, but the solution is logical.

When you get the solution to every tactic, please post it in the comments with the moves written down, of course!