I see a similar theme to alot of the situations!!

With DD, it can be anything, but recent tantrums:
because I touched the plate she was carrying (i only wanted to straighten it up for her so the toast didn't slide on the floor )
because I needed her to sit/stand still to get her dressed
because we left the park

RhyB - not letting her bring outside toys inside is a frequent one here!

I was so hoping it was a phase - mind you, I personally had a bit of a tantrum and stamped my foot a few times, as DH was being infuriating and wouldn't let me have any of the hidden stash of chocolate (doesn't he know not to refuse a women, especially one who either has pms, is on her period or pg! or in other words, whenever I'm hormonal )