- Hearing Caesar swear. I'm not against swearing and it fits some characters, like Cass, but it's totally out of place with Caesar.
Out of place? Nah, it makes sense. Caesar was a linguist before creating the Legion, "swearing" is just another use of language that applies more emphasis and emotion to the statements made than simply adding "this is important!" every time, instead. Remember, smart, charismatic and powerful people swear in real life, too - they are still human, after all.
As far as things I wish I could unsee/unhear.... "Well butter my butt and call me a biscuit" is probably top of the list, followed closely by the ranger with the Big Iron on his hip.