Firmament

It would be especially irresponsible to set off a fire alarm in a building without a fire.

I mean, you could start a fire, but arson is worse than a false alarm pull. So setting a fire intentionally is totally not cool, even if it was a safe one.

But what if it was a safe fire that you started accidentally! Say... if you were to cook some food and accidentally set off a smoke alarm and panic and pull a fire alarm, that feels like a totally reasonable thing to happen. Does it?! Doesn't it?!!

...Okay. Maybe take a step back. You already have a good excuse for not being there-- being late. If you simply walked out and said you woke up after the lecture already ended, the lengths people would have to go to in order to be accusatory are pretty extreme. This is like that time a month ago, or those other several times in a rapid string two months ago. Take a mental health day.