today at work

so i was working on a new project today and honestly i got so excited i started dancing around my desk singing the theme song from silicon valley but then my boss walked in and just gave me this weird look like i had no idea what to do next so i think he might actually be suspicious now because every time hes near me lately i get super nervous that im about to get fired even though ive been here for years. also did a silly prank on my coworker by swapping out her mousepad with one of those really old school green screens it was hilarious but i dont know if its normal to enjoy pranks at work so much or if i should be more professional all the time. what do you guys think? am i just being paranoid about getting fired or is there something i need to fix in my work personality?