It’s not an obsession, it’s a leitmotif

Dark bar
Man (walks in, squints, looks around, sits on a stool next to a shaggy dog, sighs): This free?
Dog (sets glass on bar, slowly looks over shoulder at man): You just sat on a stool.
Man (jumps to feet): Jesus! What?
Dog: Hurhurhur. (sips drink)
Man (sighs again, sits back down): Don’t, dude. It’s been a rough time, stool-wise.
Dog: Burst pipe?
Man (nods, signals to bartender “I’ll have what he’s having and bring another one for him, too”): That was just the start of the iceberg.
(Drinks arrive, dog nods, raises glass to man)
Man: I was sick all week. 38 degrees C, terrible stomach cramps. Felt like appendicitis, but right, if I know what appendicitis feels like, it can’t be appendicitis again, right. So, I’m not sure. Ate something bad, or a stomach bug, dunno. Maybe diverticulitis. Luckily I already have an initial appointment with my colonoscopy doctor, because my urologist recommended I see her after I told him the water in the toilet bowl was very often bright red, if you know what I mean.
Dog (shrugs): Huh.
Man: So, I asked my urologist, probably hemmorhoids right and he said, maybe, or it could be malignant too, maybe go have them take a look under the hood.
Man: So I called and made an appointment. Then, like, next day I notice the water in the toilet bowl is purple now.
Dog: Purple.
Man: Only then did I notice that my wife had hung a purple toilet bowl freshener thing from the rim.
Dog: Hur hur.
Man: So I asked her, honey, were you using a red one last time and she said yeah.
Dog (smirks, sips drink): Red toilet bowl fresheners are sponsored by the colonoscopy industry, I betcha.
Man: Never got around to canceling. But after my thing this week now I’m glad I didn’t.
Dog: Cheers.
Man: Cheers.