You are walking down the street minding your own business when:
"Whoooo. I am a scary man in a mask and I have just made you kill your own Grandfather at some point in the future so you will have never existed... whooo"
"Er, why?"
"Because it's so amazingly paradoxical... whooo"
"Right"
"Ah yes, but how much wood could a woodchuck chuck if a woodchuck could chuck wood?"
- DIY Sheep on Faction Paradox