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!!!".