A man is climbing on a metal support in the bleachers of a large arena , at a crowded sporting event .
It is impossible that a mad bomber climbs under the bleachers to place his bomb .
It is impossible that a mad bomber climbs under the bleachers to place his bomb .
There is a better than even chance that a mad bomber climbs under the bleachers to place his bomb .
A mad bomber climbs under the bleachers to place his bomb .