Consider the humble body pillow (also known as "dakimakura" in Japan). The perpetual icon of the lonely otaku that first gained prominance on internet chanboards in the 90s, it now is an omnipresent symbol of the weirder depths of anime culture. The dakimakura was once resigned to only the most desperately meme-worthy nerds, a representation of the tragic inability for fans to ever truly embrace their beloved 2D waifus, but in the modern context almost everything and anything can be pillow worthy.
Here's some that have moved so far beyond horny weirdness that they literally broke through the barriers of reality: