I have two puzzles - one really annoys me becasue I can't work it out! The other I just find interesting to think about.
Ok - annoying one:

There's three guys who live together and they want a TV - they find on in a shop for £30. (£10 each) and buy it.
Later on the sales assistant tells the manager he's sold the TV for £30 and the manager tells him it was only supposed to be £25 because it was in the sale. He gives the sales guy a fiver to take round to give to the three guys who bought the TV. But the sales assistant thisnk - I'll give them back a pound each and keep two for myself - they won't know.
So he gives each guy back £1 and keeps two. they have all now paid £9 for the TV - which makes a total of £27, and the sales assistant kept £2, which is a total of £29 - WHERE DID THE OTHER POUND GO!?!?!?!?!?!?
Maths is not my strong point!

The other one is - "If a tree falls in the middle of a forest when there's no one there - does it still make a sound? i.e. how can sound exist if there's no one there to hear it?"

xLx