[abbub]

I think the fins on the back of a batmobile set I have are from a dragon in one of the 'castle' sets...

[dr_orpheus]

Or the original blasters in the Star Wars sets that were backwards megaphones with a piece on the end.

[smarterclayton]

The Lego Star Destroyer has several “hammer of Thor” greebles (the interesting decorative surface details) in the engine section