Simplify the following text for a Grade 6 native English-speaking person.
Original: One of Bart 's early hallmarks were his prank calls to Moe 's Tavern owner Moe Szyslak in which Bart calls Moe and asks for a gag name .
Simplified: He likes to ride on a skateboard and make Prank phone calls to Moe 's Tavern to annoy Moe Szyslak .