An example of magical realism in sorrentino's story is
1) a man gets hit in the head with an umbrella
2) the situation continues for years without pause
3) the narrator punches the man with the umbrella
4) the narrator thinks about going to the police

2) the situation continues for years without pause

Explanation:

Magic realism is a form of literary style of writing fiction that infuses realistic events with the imaginary or the magical. Like the name indicates, it is also part magic, meaning fantasy or something that is not possible n the real world. In Fernando Sorrentino's story "There's a Man in the Habit of Hitting Me On the Head with an Umbrella" the man is continually hit on the head over a course of five years which is quite impossible to happen for real. An example of magic realism in the story is that the situation continues for years without pause, with no stopping or pause or breaks in between. This is not possible to be in the real world.  

this is a good question! i'll do some research and come back when i have the answer!