I'm one of those too. DD has started throwing tantrums for seemingly no reason at all. Often she gets annoyed because one of her toys doesn't do what she wants it to do or she gets sick of playing with it so she'll throw it and then hit it and then throw herself on the floor kicking and screaming. We usually ignore her when there's no reason for it. She very quickly stops because she's not being taken any notice of. (sometimes she'll stop and get our attention so she can throw a tantrum again).