An Aggressive Cat

I don't normally like to post about our cat, but something happened with her that was just too ridiculous not to post. I need to preface by saying this is how she usually looks. She likes to sleep on her back with her feet in the air, she does this on this one section of couch, on her bed... in the middle of the floor. You know... everywhere. She's very relaxed. She mostly ignores the boys until they get too feisty and then she lets them know it's time to back off. For the most part she really chill... like she could die and we might not know it because she is so lazy. Anyway we took her to the vet for her annual physical... 3 years too late. And the vet calls to tell us she's ready and healthy and then she informs me that we need to let them know in the future that CJ is an aggressive cat. When she said this I was confused because... well she isn't, that's just more effort than she's willing to expend... ever.  Then she proceeded to tell me how CJ attacked her when she was let out of the carrier. I was just a bit dumfounded. She seemed nervous about CJ around people and asked if we had kids. I informed her yes we do and that CJ is pretty good with them, they've come to an understanding that they don't mess with each other. And then she said we needed to come get her immediately. So Brian left work and got her, he said there was a bit of a scuffle getting her back in the carrier. He brought her home and she returned to... doing nothing. I'm still looking for signs of aggression but so far...nothing.