Wake-up Call

This is a true story.

A coach party arrived at a hotel. When they checked in, the party leader asked if they could get a wake-up call, which the receptionist agreed to. Unfortunately (at around the time they wanted the wake-up call) the hotel's boiler overheated, enough to trigger the fire alarm. Anyway, later in the morning, the party leader went up to the receptionist and said "Thank you for the wake-up call, we all heard it OK. Just one thing though - wouldn't it disturb the other guests?"