There's about showing up late, and being soaked from the rain(even though you used an umbrella), and having a really difficult time closing your umbrella when you enter the room,
that is very uncomfortable.
Especially if you look around the room and notice that no one else seems to be soaked
even have an umbrella near them.
Then you look out the window and see that it stopped raining.
So now there is no evidence for why you are wet.
It just seems like you are sketchy.