I once had a junior who...
for the sake of balance I should point out is now a very successful businessman, and he had a habit of genuine face palm moments whereby he would do something daft and immediately bury his moosh into his hands. This is not the recommended course of action to take when you have just put your hand on a newly varnished bannister to steady yourself whilst you read the "Wet varnish" sign on the stairs.

Mind you on another occasion he did manage to cover himself from head to toe in yellow toner whilst attempting to refill one of the old style colour printers that used a toner reservoir rather than cartridges. He got called Bart for quite some time after that unsurprisingly.
( number5 has been fighting tramps and losing., Thu 3 Mar 2011, 19:55, Reply)