Caillou is having fun and his Mom is in a good mood. Then the mailman comes and ditches them a bunch of bills. This spoils Caillou's Mom's mood and she then wishes aloud that she'll at least get a letter for a change. Caillou's Dad passes by as Caillou's mom leaves the room. He asks Caillou why was Mommy's upset. Caillou then explains that she doesn't like bills and wishes to get a letter instead. Caillou's dad then comes up with a really strange idea: Send out Caillou's drawing as a letter to Caillou's mom. They do a good job keeping it a surpirse from Caillou's mom, though. The next day, they meet up with the mailman and gets him to deliver the letter. When the letter arrives later that day, Caillou's mom decides that she likes the letter and wants to keep it forever. (thetvdb.com)