My tax rebate from last year.
Which wasn't a slip-up, but still resulted in a big profit.
( The Mock TurtIe ™ --- Thinks you are a cunt, on, Mon 18 May 2009, 22:24, archived)

Mine was a bit rubbish
I should have claimed for that work I had done on the moat.
( wotofco pissing in your swimming pool, Mon 18 May 2009, 22:26, archived)