Out of the mailbox, Calvin gets a letter he wrote to himself. He reads it to Hobbes. It asks what day it is, since he's writing it on Monday. Calvin says his past self is corresponding with his future self. Hobbes says it's too bad he can't write back.

Calvin got another letter from his past self. The note reads that the future Calvin has done things the past Calvin hadn't yet done. He calls the future Calvin a lucky dog. Calvin feels sorry for himself two days ago.