Why did the koala fall out of the tree?
It was dead.

Why did the second koala fall out of the tree?
It was stapled to the first.

Why did the third koala fall out of the tree?
If was in the second's pouch.

Why did the fourth koala fall out of the tree?
It thought it was a trend.

Why did the fifth koala fall out of the tree?
Peer pressure.

Why did the sixth koala fall out of the tree?
It was suicidally lonely.

Why did the tourist die?
Six koalas fell on him.