When you're parsing SO's questions from your cellphone, you find one that's easy, you answer it, then when it's done, you read the question again to realized you totally missed the point.

When you realize that the StackExchange app doesn't allow you to delete your own comment, so you have to rush to the nearest computer to delete your answer before anyone downvotes it.

When you sit back again to resume your breakfast, the adrenaline rush slowly fading away.