Counting

Man walks down the street and sees a guy jumping up and down on a
manhole cover shouting, '49.... 49.... 49....'

The man asks this guy what he's doing, and the guy replies, 'No man,
its great fun. Here, you try.'

The man looks at the manhole cover, thinks waht the hell, and proceeds
to jump on it. The guy quickly whips the cover away from underneath
the man, and the man plummets to his death in the sewers. The guy
replaces the cover and starts jumping again,' 50... 50.... 50....'.