DISCLAMER, THIS IS AN AU WHERE YOU ARE MALE, YOU CAN CHANGE YOUR GENDER NOW IF YOU WANT :D

You had been Sans' only best friend, other than his brother, Papyrus. Recently, he has been acting...a bit weird lately, you two were roomates, and he would usually lock himself in his room. One day, you decide to check up on him. You go to his door, what do you do?

A) Knock.

B) Bang.

C) Try to Open.