When Moshe ascended heaven to receive the commandments there is a tradition that Hashem changed his appearance to that of someone else. Why was he changed and to whom was he changed? Is there a source for this tradition, I can't find it.
Or in a slightly different version, "hey angels, you're not such hot stuff yourself, you had milk and meat when you visited this guy, remember?"
Gemara Shabbos 88b-89a has several similar stories of G-d & Moshe defending against the angel's claims, though not this one.