GRRRR. I've lost my keycard for the second time in 4 weeks, warranting a £20 replacement fee which I can ill afford.

Other things I have lost recently:
Pens
£2.50
A burrito (I just put it down and it was gone)
The important email a company sent to me about my debit card

How can I avoid losing so much junk? Also, regale me with things you have lost. ('Virginity'= BAN REQUEST)