In English, 'butterfly' sounds warm, and kinda tasty (see 'butternut' and 'butter popcorn'). In
French, 'le papillon' sounds, well, typically
French and limp-wristed. In German, DER SCHMETTERLING sounds like something that could do you serious damage. It sounds like it would casually flap towards your face, then
slap you in it with its 10" schlong. Not to be fucked with.