I've heard this in many placed, though I'm not sure where it originally came from (not necessarily bad astronomy, just hypothesis):

I've heard it cited in movies, books, and in comic stand-up: "what if our universe is just an atom in the cell of a body of some other man in another universe - and what if we hold infinitely many universes in our bodies..." Yeah one could go on for whatever effect they want; I've heard a lot of permutations. Does this have a proper name?