I can't really say if this was embarrassing or not, because nobody else ever knew about it, but it sure made me feel stupid.
Back in the '70s in junior high (now 'middle school', I guess), I started carrying a cheap switchblade stamped "rizzuto estileto Milano" in my RF pocket, along with a standard medium stockman(Schrade or Buck) in my LF pocket (for the real cutting chores). I thought that carrying a switchblade made me 'cool' because it was illegal (3" blade), and I thought of myself as 'The Man With A Switchblade'.
In reality, it was a real POS. Although its push-button opening worked fine, when closed, the tip stuck out of the handle, and there was all kinds of play in the locked-open position. One day I was sitting in class after lunch and felt a slight poking sensation in my right nut sack, but didn't think too much about it until later, when I discovered that the switchblade (despite the safety) had come partially open in my pocket, and the blade tip had been very lightly poking me in the you-know-what. In private, I checked for any damage, which thankfully there was none.
I stopped carrying that knife cold-turkey after that. So much for 'The Man With A Switchblade'; I very well could have been 'The Man With A Pierced (you-know-what)'.
Jim