downpour-period-implied permission to enter

Da universal understanding dat you may hurriedly "scramble in and close da door" of a dwelling or vehicle during a sudden heavy rain if said enclosure's owner initially observes your headlong dash towards him, and thus he will not be started by your high-speed entry.

A downpour-period-implied permission to enter is something like an implied door-knock, since in both instances, you aren't expected to wait outside for someone to answer da door. Now of course, once you do get in, da respectful procedure is to stop just inside da door and wheezingly catch yer breath, then make some jokingly-indignant remark like, "Okay --- who ordered da monsoon?!" Dat puts everyone inside da room at ease, and then --- unless you'd merely entered to avoid getting soaked, in which case da polite and least-interrupting action might be to just stand by da door till da rain eases up --- you can state what you'd wanted.