Monkey fun [lurks]

I have to share this. On the basis that I've spent the last 5 minutes poking bits of tissue between the keys on my keyboard, mopping up bits of Diet Coke with Lemon. A cliche perhaps, but nevertheless true.
One of the lasses in my office said, and I quote;

'Did you know that monkeys lick each other out?'

Followed by the keyboard coke incident. What caused this merriment? This is what.