I think there may be times when someone says they know something and we have to take their word for it. At the moment I have a very annoying itch on my left testicle but seeing as I am sat in the office I cannot do anything about it. If it continues I may have to go somewhere discreet. I cannot produce anything to prove it. Sorry.

One-upmanship:

Man goes into pub and says to his mate "Between you and me, pal, we have five testicles!"

Mate replies "Why, have you only got one then?"