I've only been embarrassed twice.
The first time was in high-school, when I had to perform a skit in front of my English class. It was something related to Romeo and Juliet, and I remember being way, WAY off-cue, hitting my head on a flourescent lamp and afterwards (or maybe before, during rehearsal) getting caught staring at this girl's boob.
The next incident occurred in college. I used to be big into those social networking sites, like Friendster and MySpace, and while browsing through profiles I found an interesting turn of phrase on some girl's page. I liked it so much I used it on my own profile, which was pretty harmless now that I think about it, but when she emailed me asking where I had heard it I couldn't help but feel like a dirty plagiarist.
What's interesting about both occasions is that afterwards, I had to physically -- repeatedly -- restrain my index finger from scooping out my right eye.
The term for self-induced ocular trauma is "auto-enucleation," but I like to refer to it by it's other name: "oedipism." According to my therapist, Google, "oedipism is a rare form of self-mutilation, occurring with paranoid delusions, either as a result of a drug related toxic psychosis or in functional psychoses, such as schizophrenia. It is most often described in acutely psychotic patients, who have deep-seated religious or sexual delusions."
I guess I'd better start laying off the acid and pornos.