Doh! I forgot that's where I got it from. Was in a huge rush and tidying up my image files and didn't think to check first.
I think I posted it. I just read an article about dream research where a woman woke up sick and discovered a half-eaten buttered cigarette. This caused me to think of this joke which seems to be appropriate here:
George: Last night I dreamed I was a woman named Sandra and went to a party.
Ralph: Last night I dreamed I went to a party and met a woman named Sandra. We had sex afterwards. Let me know if you get pregnant.