Well Shokugeki no Soma OP 2 has been stuck in my head for a while now.. And now since they released the full version of that OP 2 like few days ago I have been listening it for non stop..
Also I have listened a lot Charlotte OP and ED.. Both so are so catchy so they get easily stuck in my head. Same goes with that Shokugeki OP 2 (First ED was also really cachy one).