how to make a guy nervous??

Nicole • Just making a mental note here since I couldn’t find anywhere else in the app to take notes: Started birth control pills - September 11, 2016 Ended birth control pills - October 31, 2018
Okay so one of my guy friends/extremely attractive co worker said today that nothing makes him nervous and that he would love it if I could find a way to make him nervous.. So I was wondering, what would you guys suggest as a way to make him nervous?? 🙈