The Beggar's Deceit

A legless beggar with a sign around his neck saying "cripple" pushes himself slowly and laboriously on a trolley along the pavement, soliciting alms from sympathetic passers-by. A policeman gradually approaches from the distance. Feeling suspicious, he taps the beggar on the shoulder, whereupon the beggar leaps up in a panic and runs away on his perfectly functional legs. The policeman trips over the trolley before recovering his footing and setting off in pursuit.