My daughter wasn't calmly going down for a nap today, so I eventually went into her room to determine whether she was really ready to sleep yet. I picked her up, and she got so excited that she started waving her arms. This excitement reaction is typical for her (although not usually when I think she's ready to sleep). In moving her arms around, she kept hitting my arm, which made the gentle slap sound of skin to skin contact. That was very thrilling to her, so she moved her arm faster, because she was more excited, which made more a slapping sound, and it just built on itself. It didn't hurt, and in fact made me laugh, so she kept it up until I was tired of trying to hold on to her in her excitement.
Oh, and yes, her nap was seriously delayed today.
