January 18th is known as International Laughter Day, a great time to remember how Ayrton Senna – even as he remained 100% focused and driven – used to lighten the mood in F1’s competitive environment. Besides being considered an excellent joke-teller, the driver was also famous for his birthday party shenanigans: he used to prank whoever was being honored that day.

Check out a few instances in which friends of the Brazilian driver became targets of his sense of humor.