悪戯

1. Origins, structure, and basic meaning

• Structure: 悪戯, read いたずら, is a prank or act of mischief.
• Basic usage: 悪戯をした describes carrying out a prank; 誰かの悪戯で explains why an alarm clock was hidden.

2. Common pitfalls and similar expressions

• Mischievous act and causal prank
  • With をした the prank is the action itself; with で it becomes the cause of a resulting situation.