He inhaled mustard up his nose (a Calvin and Hobbes fan will get it)

He stepped on lego

He's just Been flashed

He's having an invisible sort of lobotomy

I know I already did one but I have to put this one out:

He ate a taco on the toilet

He bout to sneeze.

He’s got a role in a TV show

He found out a girl likes him

He had a seizure from watching all of the crazy strobe parts in Stranger Things. (especially Season 3)

He just found out Mike likes the Demogorgon