Any anime series you're ashamed or embarrassed you watched?
For me, it's "Cream Lemon" (an old 1980's hentai series).
One of my friends dared me to watch the first four episodes, and I accepted, despite the fact that hentai is SERIOUSLY not my thing.
After watching it, I was somewhat relieved that it wasn't quite as freakish as I feared...
But even so, I still felt pretty embarrassed for watching it.