This thread is really quite funny!
Erm myself....
Well me and my bf did play around with icecubes a bit. Which although was cold, it was fun. They melted away though..
(try giving your bf's a blowjob with ice in your mouth!)
Erm, I think there was a carrot back in the day too.
can't think of anything else at the moment.
At school I heard that one girl was using a frozen sausage and it defrosted and got stuck. She had to go to hospital to have it moved, apparantly.