I get so frustrated with my 2.8 year old DD and she purposely winds me up I'm sure. I tried leaving the room today and she was in such an angry state (because I'd ended up having to hold her in a vice grip to get some cold sore cream on to her) that she wet herself just as I came back in to the room.
I tried to get her to come to me off the sofa so I could sort her (and the sofa) out and she resisted and yelled some more, so I yelled back - horribly - through gritted teeth, nasty yelly growly shouts and everything.
We ended up friends but I hate seeing red like that and don't know how to stop myself