The supervisor said, "Yes, it's a rock, but I have to look at it. Besides, I told him the next time he called me over to look at a rock, I was going to take it out and beat him with it..."
I had no idea that there were TSA agents with a sense of humor.

FWIW, almost all the TSA agents I've ever dealt with have had a great sense of humor.
Even the nonsensical ones.
Wish you had used a better examples for a lighthearted thread than something that obviously could be used and should be flagged by the TSA.
FWIW, I took the fork thing to be an example of a *strange thing* that TSA didn't let through. Not that it made no sense, just that it was a strange thing.
My mom had nutella type spread taken coming back from belgium. the bad part is that she bought it at duty free so it should have cleared. very disapointing.
When did it get confiscated then?
Wow! What airport was that? They acted like they had never seen a waterpik before.
I bet there are MANY people who haven't seen a waterpik before. I haven't used one since the 80s. I hadn't seen one since then until a few months ago when we saw one at Costco. And we stopped to look at it because I truly thought they weren't being made anymore, and because my son had absolutely NO idea what it was. He was utterly fascinated by it. And he wouldn't have seen it still if we didn't have the habit of going up and down all aisles at costco even on a quick trip.
I bet they really had not ever seen one.
People who have no issues with TSA have never been separated from their child in line.
They aren't supposed to separate you from your child. It nearly happened with us; DH's shorts zipper set off the metal detector and he was taken off. Then what turned out to be my 1.5 inch totally normal and common Goody brand barrette set off the metal detector and after a few times going through without knowing what was causing it, they were pulling me aside and away from my little dude. I was telling them *wait, my child is here* when my favorite fellow passenger ever (total stranger) told me that I had a metal barrette in. I took it out really quick, tossed it into a bin to go through the xray, and walked through one more. No alarm. No separation. Whew.
But I have no doubt they would have listened to me.
You have very weird experiences. I have the Irish face that gets me "you look just like my old friend..." every time, with hair that can be almost any color except for black depending on the light, etc etc, and I only rarely get pulled out of line. Weirdly, my husband is biracial as well, caucasian and Korean, though most people guessing would say he's Mexican. He used to get pulled out but now he doesn't. He doesn't even though he travels for work as a product tester and often has upwards of 12 electronic devices on him, some of which aren't actually on the market yet, and I think he's only been taken to a back room once since 2009.
I hope that for the more egregious ones you have actually made official complaints. Because that's a weird set of things. They took his shoes? That doesn't even make sense to me.
It wasn't taken from me but it got me pulled aside and this was long before 9/11. I had a woven metal belt that I had coiled up and due to it being a rather expensive accessory I had packed it in my carry on. When my bag went through the Xray it was flagged and the agent asked who's bag it was and what was inside. I said I had nothing but clothes and toiletries. He then asked me about the .......handcuffs..... and what they were for.

They thought my belt was a set of handcuffs

I opened the bag showed them the belt and they all started to laugh.
Which reminds me of my story from 2000, when I was traveling home from my stepdad's, having buried my mom and having avoided going back home to my sad and lonely momless life as long as I could. I had taken all of her jewelry; some "real" and some just pretty stuff. She had them in her very wide dresser drawer in wooden wine boxes cut down, and they were stacked in my carry on.
Of course the security lady noticed all the metal. Asked what it was as she opened the bag. I said that I had just inherited all of my mom's jewelry.
And she tells me how lucky I was.
I felt no fear of reminding her that I had *inherited* them, which means she had died, and the security lady closed up the bag and let me on through.
Nothing yet, but I'm just waiting for the day they keep my teenage son's shoes. He wears a size 19, and every time they are sent through the scanner, they have to stop an examine them.
Ever consider urging him to wear flipflops through security?