Apology Letter For Setting Off Fire Alarm

Dear {Recipient},

Please accept my apologies for setting off the {building/school/etc.}'s fire alarm on {date}. I thought it would be funny to trick people into thinking there was a real fire, but after seeing how much my prank worried and inconvenienced everyone, I realized just how inconsiderate and immature my little stunt was.

I'm really sorry to everyone for the trouble I caused. Rest assured I have learned my lesson and this will not happen again.

Sincerely,
{Your Name}