Favourite Demotivational Posters

[Colinmac93]

We all like a good demotivational psoter, but what ones cause you to roll on the floor laughing, or have actually inspired you?

Mine has to be this one: http://verydemotivational.memebase.com/2010/02/24/demotivational-poster-tali-tubbie/?from=recMap1