And even their young children know something is up.
In this exclusive clip from the movie (in theaters on Friday), their adorable daughter (Giselle Eisenberg) asks Segel, "Why do we keep having all these days and then going to bed at night and then having all these days and then going to bed at night?"
Segel explains, "That's sort of what life is."
When she asks if it will ever end, her older brother (Sebastian Hedges Thomas) says, "It'll end when we die."
But Giselle keeps going. "Won't I get bored at doing this stuff again and again and again?"