I just heard this one on Classic FM:\r\n\r\nQ. What's the difference between a viola and a trampoline?\r\nA. Generally you take your shoes off before jumping on a trampoline.\r\n\r\nBut my favourite is still:\r\n\r\nQ. What is the difference between a viola and a chain-saw?\r\nA. If pushed you can use a chain-saw in a string quartet.\r\n\r\nMore please . . .