My kid asked:
Ki Sisa 32:1 says that, when Moshe didn't return from Mount Sinai when the people expected him to, they said "this man Moshe who brought us up out of the land of Egypt, we don't know what has become of him". Rashi comments that "this" means that they saw Moshe: specifically, [as Shabas 89 amud 1 makes more explicit,] that the satan showed them Moshe's corpse being borne.
Why, then, did they say "we don't know what has become of him"? They (thought that they) knew what had become of him: he had died.