Calvin- Planet Spuzzbog, where there aren't any moms to ask me where I'm going!
Mom- Well, be back in time for supper.
Calvin- Uh, yeah, sure. Come on, Hobbes.
Hobbes- Doesn't she know that Spuzzbog is 20 light years away and by the time we get back, our faster-than-light drive's time-dilation effect will have rendered her a withered old crone while we only age a few hours?
Calvin- All I can say is she'd better have dinner ready. And it better not be cold.