I am pretty sure Danny has a cold or something throughout the entirety of the mario kart 8 deluxe playthrough. I'm only on episode 4 from it and Danny is audibly stuffed up, sniffly and blew his nose at the end of episode 2 (or 3?) After he blew his nose, he whined for a little bit (so cute!) and at the beginning of episode 4, he's reeallly stuffed up. It sounds like he has a lisp, and he makes a comment about it, tis very nice
EDIT: Danny has a cold! Arin said "You're making ME mucusy from being in proximity to you. Not sick but, sympathy mucus." and Danny is REALLY stuffed up. Its pretty great