We had some bad fights when we were first dating. We are not good phone talkers so a lot of things become misunderstood, and it was still early on in the relationship so we didn't know each other like we do now!
I do remember one really bad fight we had after our wedding. That first month or so was pretty rough for us, we had been so busy planning the wedding & getting the house ready and after moving in it was just a lot of adjustment overall. I don't remember why we fought, but I remember leaving to take a walk around the block (w/o telling him), then sitting in the shower crying lol.
Now I feel like it's really hard for us to fight like that b/c we know each other so well and we know not to push certain buttons and how to let each other cool off.
ETA: I edited the subject since we're also talking about the topics people fight about most!