Oh, yeah, in Japanese class, we referred to each other by last name and had to write it in katakana on our papers. Mine was katakana-ized as Karimurimu, so my TA and some of my friends in the class would be like, "Karimurimurimurimurimurimurimu......-san."

Idk, I have a ton of not-so-flattering nicknames, but only a few random ones are considered 'embarrassing' to me. XD