I went to a rally a couple of years ago and spotted what I thought was a LE officer, he was obviously checking the crowd not the speakers..i walked up to him and asked what agency he was with..I said I was undercover also(i did not say undercover what!) . He tried to deny it and hurridly walked off. I wont describe the other tell here but its a pretty good one and not a weapon, experienced undercover agents know better, he didn’t.
Nice one.
I have a $35 watch I wear for doing yard work. After 20 years it broke and couldn't be fixed any more. I went to Walmart to look for another, and saw the exact same model in a security-sealed plastic case. I held my scratched-up old one next to the plastic case to compare them, and was inwardly rejoicing that I'd found exactly what I wanted, when a clean-cut, physically fit guy in this late 40s ("retired military" vibe) started "browsing" rignt next to me. LOL!!!
So I showed him my old watch and gushed about how lucky I felt finding the same one after 20 years, made him look at the comparison, gushed again about how long the other one lasted, what a great deal, yip-yip-yap-yak-yak-yak (I'm an old woman), and as I turned to head for checkout, said very sincerely, "Have a blessed day, officer!" The look—swallowing his urge to smile—hahahahaha!
I went to an outdoor concert dressed in khakis, white shirt, boots and a cowboy hat. As a joke, I made a label that said Park Ranger and stuck it to my shirt. I ended up talking with a couple of sheriff’s deputies who treated me as one of them. Fun times.