Custom pipes and bongs can be beautiful, almost approaching "high art" in their craftsmanship. But like any medium, there's always going to be a handful of abominations good for only gasps and giggles. It's baffling enough that somebody would want to make something like a combination sex toy/pipe, but even more confounding that people actively seek out and buy stuff like that -- for a lot of money, sometimes.
Butthead Loves Hello Kitty: We found this, uh, thing online at the Museum of Kitsch. It depicts a pop culture coupling (doggie style) between Butthead (straining from behind) and Hello Kitty (looking startled in his lap). It's pretty funny (in a vulgar sort of way), but seriously, you would have to be high to smoke anything out of this.