Imagine Jack just getting really mad or happy and he just starts rambling in spanish, and everyone is like "???"
YES!!!! jack is definitely the kind of person who once he gets heated, whether that be as in angry or super excited, he'll just switch languages and although the has the Spic Trio™ to understand him, most people dont, so it becomes a bit awkward after when hes trying to explain what he said. if he starts ranting you best bet by the end of it he'll have worked himself up into doing it in spanish, and even in general he's the kind of spic to just insert words in spanish here and there whenever he talks. part of it is just him trying to like cling onto the language and not forget ir given that his parents are gone. part of it is just that he cant help it.
no one:
jack: el pinche pendejo was trying to sell it for doubled the price like i dont know my shit. hijo de puta.