I won't claim perfect pitch, but do claim relative. There's a subtle difference. I've explained it before, but simply put I'll sing a song in the key you taught it me in, unless you ask for a different one. Then I have to think about it.

I do have a friend with perfect pitch. He's very useful, especially if you have something you want writing out. Typical conversation:

"Hey Rob! Could you write out this song for me please? The harmony gets too complex for me"
"I'M NOT YOUR PET"
"Yes you are Rob. Yes you are"