A man in a blue jersey and orange visor threw a frisbee along a grass hill .
Chances are about even that a man in a blue jersey and orange visor plays fetch with his dog .
Chances are about even that a man in a blue jersey and orange visor plays fetch with his dog .
It is certain that a man in a blue jersey and orange visor plays fetch with his dog .
A man in a blue jersey and orange visor plays fetch with his dog .