What was the best thing before sliced bread?

I was bored and had far too much time on my hands so I started asking myself random questions, in my head obviously, and I really couldn't figure out the answers to them.

Here's a list of some I was thinking of:

• If one synchronised swimmer drowns, do the rest have to drown too?
  
  • If a man with no arms has a gun, is he armed?
  • When cheese gets its picture taken what does it say?
  • Is there such a thing as a closet claustrophobic?
  • When French people swear do they say 'pardon my English'?
  • What's the speed of dark?
  • Why don't sheep shrink when they get wet?
  • Why are the RSPCA not concerned about toad in the hole?
  • If a tin whistle is made of tin what's a fog horn made of?
  • If Big Issue was printed in A5 size would ie be known as Little Issue?
  • Why is a boxing ring square?
  • How does the snow plough driver get to work in the morning?
  • What did they go back to before they invented the drawing board?
  • Why do your feet smell and your nose run?
  • Do chickens think rubber humans are funny?
  • How do the "Keep Off The Grass Signs" get there?

Answers on a postcard.