"There were three men, a Ghanain, a Nigeria man
and a Welshman, and they all climbed up to the
top of a cliff. At the top they met a man, and
the man said "If you can take your watch and drop
it down the cliff, catch it again and bring it
back up I will give you $500."

The Welshman thought he could do it, so he
dropped his watch and ran all the way down to the
bottom of the cliff, and he came back up with his
watch in pieces.

The Ghanian thought he could do it as
well, so he dropped his watch and jumped down
the cliff and came back with his watch intact,
but he was on a stretcher.

The Nigerian man thought he could do it as well,
so he dropped his watch and walked slowly down
the cliff, and he came back up with his watch
working.

The man said, "How in the world did you do that?"
"I set my watch back two hours," said the
Nigerian man

i wish i understood the joke, can someone explain

Joker,

Pls explain this joke.

Only persons with high IQ like me can understand the joke.

^  ^ ^ GBAM!!!! Thank you 

Ok my boy!