I always thought Excellente Bueno was a great character for making a non-sequitur moment hilariously creepy as well. I should point out that I didn't really like that group he ran with and he's the only one that stayed in my mind. And in ceratin nightmares, but I respect that.
Thing about Ennis doing this kind of stuff: the over-the-top stuff is almost always in the service of comedy(except in CROSSED where it's pure horror, but it has its moments as well), and he does it better than a lot of other writers who try to imitate him. I think of Ennis as being in the same spirit of Parker & Stone, or some of the more extreme Python, or in HITMAN, PREACHER's seedy, beer-drinkin' urban third cousin, "the Young Ones," totally(reading HITMAN I often thought of it as where Ennis put all the ideas too sleazy and ridiculous for PREACHER, like it was his notebook, but that was fun). Or further back, Terry Southern or Michael O'Donoghue. Or shows like DEADWOOD.
It's Ennis' intelligence that makes it work, whereas Millar, when he tries, seems to be a lot more, "Here, have this, fucking fanboy! You like it? I'll make it worse! Mm, lovely money!" I don't know, but having had some actually-Irish friends, including two from Cork and one from Belfast(two of them women), I'd suggest that where Ennis lives this stuff is very much a laugh. They likes their gross-out, profane, over-the-top and pitch-black humor. And "fuck" and the c-word(both of them) are totally punctuation. I always took it as kind of a dare to relax. Because people who have lived through real problems, I guess, don't feel so threatened by words and pictures. That was certainly how it felt when I found myself much more easily shocked than them, whereas among Americans I have a high threshold of moral offense. Then you hear an Irish girl make a joke about rape, and you wonder if you're more sheltered or more aware. It's a weird feeling.