It's not that awesome, since simply 5...Nxe5 would have won for Black. White made a blunder that happened to be a superficial trap, and Black fell for it.
Legall's Mate
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I am fairly sure that white intened for black to take the queen when he made that move. The factthat he knew the next three moves implies that he already knows lemalls so would be intending to do that.
At first seems pretty auseome but actually as Scarblac said 5...Nxe5 wins easily for black
This only works if the queen's knight hasn't been developed yet. Careful!
This trap is very handy for blitz games. : )
ADK
Yeah it's a common trap, and result as a shameful lost for the opponent. Still, nice mate.