A cowboy rode into town on Friday, stayed three days, and rode out again on Friday. How did he do that?

Friday in
this riddle is the name of a conveyance: a horse, car, motorcycle, etc.anything that can be
ridden.

The other clue word in the phrasing of the question is on. The
riddle could be worded came into town on, arrived in town on, or even went to town
on.

Since we pair ride and on in English, the riddle will work with
anything that can be sat on and ridden. Traditionally, the answer is that the mans horse is
named Friday. While Friday is an unusual name, it is not unheard of. Other examples of English
names that refer to more than one thing include April, May, and Robin.

Also,
the length of time the cowboy (or man, or woman) stays in the town can vary to anything short of
a week (if the cowboy stayed one week, it would be Friday again, so he would of course leave on
a Friday).