I don't understand the point of cussing in software comments. Comments describe the reasoning behind the code, and this shouldn't be emotional at all, but infor

I don't understand the point of cussing in software comments. Comments describe the reasoning behind the code, and this shouldn't be emotional at all, but informative. We don't see language like this in bus route pamphlets and assembly instructions, so why is it in source code? Yes, I understand that sometimes software can be frustrating, especially when doing integration work, but swearing does not contribute anything positive besides a bit of a chuckle from some people. I'm not offended when I see it, just disappointed that the documentation isn't as clear as it could be. Leave that kind of language to mailing lists and forums, which are designed for venting. If this came up in a code review, I'd reject it on the grounds of not being relevant to the code.