Suddenly there is a screaming of sirens, and you find yourself surrounded by truncheon waving policemen.
'I don't know what it is you're trying to do, but whatever it is, it's probably illegal.
'It's no use,' says one 'you might as well give yourself up. We have you surrounded.'
'Yes I know,' you reply 'it says so in the previous paragraph.'
'You are under no obligation to say anything,' says one of the policemen, 'but whatever you do say will be taken down and cleverly re-interpreted as a confession by our highly trained police semiologists.'
With a wave of his magic truncheon, the policeman says the magic words "Evening all!" and you disappear in a puff of self-raising carpet shampoo. Click here.