Down here in Australia, we have:
VH-ASS - an Conaero LA-4.
VH-BUM - a CAC CA-25.
VH-DIK - a Bell 206B (owned by Dick Smith).
VH-POO - a Cessna 210.
VH-CNT - a Piper PA-38.
VH-SEX - a Piper PA-30.
There's probably more funny ones out there, but searching through the whole registrar would take a little too long for me! Have a go yourself
here.
Cheers,
Soulman.