1.   Pushing her in the river seemed like a harmless prank, but it ended in tragedy.

2.   But the harmless prank phone call of old faces a new threat.

3.   For my money, these stories are harmless pranks compared with some of the elephantine extravagances heaped upon the corporate world by our own government.

4.   He said he never thought about their plans as more than a harmless prank.

5.   How will a law differentiate between a vicious terroristic threat, a harmless juvenile prank and a socially revealing satire?