There are probably a ton I'm not thinking about at the moment.
But in true sitcom style, I had two people walk in on my boyfriend and I during sexy time. First my roommate did when she was scheduled to have class and never shower up around that time. Then a minute later a friend walks in, oblivious to the situation and gives me my phone since I forgot it in the lounge.
We were both under a blanket watching her talk about how I shouldn't leave my phone out. My roommate is shaking her head staring at the floor. I just die laughing, which makes everyone but my friend laugh. You see her look around and it "clicks" she rushes out the room yelling "I'm sorry, I'm sorry." She also has a very strong indian accent, which made it more hysterical at the time.