Even if you read the parenting books before your first kid arrives, you are simply unprepared for a lot of things. Sure, the diaper-changing and the constructive playtime are all covered, so you think you've got that down. But when the kid has been around for a while, you slowly start to realize that you are spending most of your parenting time doing things that no book warned you about.
Vote up the stuff you spend the most time doing, and add anything that's missing.
Daydreaming of bedtime
Futilely organizing the playroom toys
Feeling guilty for staring at your screen instead of engaging them
Shouting at the back seat of your car