Hey, I got some cool ones u can use

sing loudly "ON TOP OF SPAGHETTI, ALL COVERED WITH CHEESE, I LOST MY POOR MEAT BALL, WHEN SOMEBODY SNEEZED..."

walk calmly into the elevator saying "this is my first time on one." then wait until the doors close and bang on the doors and walls screaming loudly, "HEEEELLLPPP! LET ME OOOOOOOOUUUUTTTT!"

jump up and down when the elevator goes down or up laughing and shouting "POTATOES!!!!!" repeatedly

make a random sound when somebody starts talking acting mad and not wanting anyone to talk

pretend like you are sick and say "I think I am going to throw up" weakly

go to the floor farthest away from you and walk out every time somebody comes in on the way to the floor you were going to go on. then when you walk out a few steps, run back saying "WAIT DOORS! DONT CLOSE YET! I'M ON THE WRONG FLOOR!"

make random animal sounds

pretend like you are crying, press all the buttons, and say "I WANT ONE!" to another person standing next to you

ask of someone has an extra pair of underwear with them

ask someone if they want to see your wenis (elbow skin)

bring a small pinecone with you on the elevator and say "its ok George, its alright" to the pinecone while holding it near your face, rubbing it

ask someone "guess what?" they will say what. say "guess what?" again. repeat the question over and over and when they shout "WHAT!!!!!!!!!"
say "I was just asking a question!" while acting scared

act like a psycho person, rocking your head back and forth while smiling absently, sitting in the corner of the elevator