Top three most effective opening traps?

Another one from the Caro-Kann:

Owen's Defense backfire:

Englund Gambit famous trap:

I saw a decent club player fall for the Blackbourne Shilling the other day.

It made me look into it again. "Don't take the free pawn" is what I remembered, but actually, if you do, after Qg5, Bxf7+!? is not so bad for White.

That must be fun. First watch the glee with which your opponent plays Qg5, only for it to turn into shock after Bxf7. But it won't happen. I don't play the Italian, and hardly anyone plays the BSG and with good reason.

I saw a Youtube video a while ago, where a GM got positively angry at people playing the BSG. "You may win the odd game, but it will not make you a better chess player," was his position.

This is Fishing Pole Trap

 The funniest.

good trap

That very good

The most effective opening trap is getting intermediate players to study them, thus keeping them at that level forever.

A trap against 1... a6 (unfortunately rarely played)