I got this joke from a friend, and I thought I'd share it with you guys.

2lbs.
The Colonel's Order
A COLONEL ISSUED THE FOLLOWING DIRECTIVE TO HIS
EXECUTIVE OFFICERS:
"Tomorrow evening at approximately 2000 hours Halley's
Comet will be visible in this area; an event which
occurs only every 75 years. Have the men fall out in
the battalion area in fatigues, and I will explain
this rare phenomenon to them. In case of rain, we will
not be able to see anything, so assemble the men in
the theater and I will show them films of it."
EXECUTIVE OFFICER TO COMPANY COMMANDER:
"By order of the Colonel, tomorrow at 2000 hours,
Halley's Comet will appear above the battalion area.
If it rains, fall the men out in fatigues, then march
to the theater where this rare phenomenon will take
place, something which occurs only once every 75
years."
COMPANY COMMANDER TO LIEUTENANT:
"By order of the Colonel be in fatigues at 2000 hours
tomorrow evening. The phenomenal Halley's Comet will
appear in the theater. In case of rain in the
battalion area, the Colonel will give another order,
something which occurs once every 75 years."
LIEUTENANT TO SERGEANT:
"Tomorrow at 2000 hours, the Colonel will appear in
the theater with Halley's comet, something which
happens every 75 years. If it rains, the Colonel will
order the comet into the battalion area."
SERGEANT TO SQUAD:
"When it rains tomorrow at 2000 hours, the phenomenal
75-year-old General Halley, accompanied by the
Colonel, will drive his comet through the battalion
area theater in fatigues."