I played a very nice miniature on this site the other day, and got to this position:
This position is a mate in 3. As I am a Tal fanboy I decided that I should not win this game without saccing a piece, so played Bg5+, giving me a mate in 4. Of course e5+ straight away wins faster, but I always loved to mate when my opponents king is hindered by his own pieces. So in this position, did I spoil this game by playing Bg5?
Here's the whole game btw, notice that if dxe5 instead of Kf5, there follows Qxe5+ Kxf7 Nxh8#.
I really hoped he would go for that one, but alas.