Several dozen brunette, redhead, and blonde guys were facing execution via

firing squad. The firing squad took the brunettes first, and the leader

said "Ready, aim ... " at which point the brunettes yelled "Earthquake!!!".

The firing squad looked around anxiously and while they were trying to

figure out whether there was an earthquake or not, the brunette guys all

took off and escaped. Undaunted, the firing squad took the redheads next,

and the leader again said "Ready, aim ... " at which point the redheads

yelled "Tornado!!!". The firing squad looked around anxiously and while

they were trying to figure out which direction the tornado was coming from,

the redhead guys all took off and escaped. The firing squad took the blonde

guys last, and by now the blondes had it all figured out; when the right time

came just yell out the name of some natural disaster. So when the firing

squad leader said "Ready, aim ... ", the blonde guys all yelled out "Fire!!!".