Only two that I can think of.
When the dentist uses certain instruments on my teeth/gums.
It tickles like mad, and I cant stop laughing, or moving around.
Another involved this site, a long time ago. I posted about this many years ago.
I'm sure some of the earlier members like myself remember how this site used to be a lot less secure, and basically anyone could just come on and off without s secure consistent TMF name.
One time in about 2002 right after I joined this site, I was talking to someone, and forgot to ask age.
Suddenly a screen flashed that said,
"Attention, you are in trouble with the law for conversing with minors"
I thought it was real, freaked, and thought I had to get a lawyer.
I spilled the beans to my mom that this had happened, and that I might need a lawyer.
Shortly after that, I talked to an admin, and was advised that the screen that had popped up, was nothing more than a fake troll, and had happened to others.
Thus, no lawyer was required, but my mom knew I belonged to this site, which never would have happened if that screen had popped up.
Besides my mom, I've never told anyone in my real life about this site, except for a couple of friends, who know/knew I have a tickling/foot fetish.
Simply put, it';s no one's business.
I guess that is my Embarrassing experience.