I recently played a server game where I had been winning right out of the opening when we reached this position with black (me) to play:
I was looking at a game by a couple of near-beginners on Youtube yesterday where the guy presenting the game beat a higher rated player with the same tactic white has here if black plays 1...Bxg4, namely mate by 2.Nf7-Nh6-Qg8 and Nf7. It's one of those tactical tricks you see in books but never come up in your own games. Odd that I should see the same thing two days in a row. I saw it here though, avoided it and won quickly.