Well, Jeri, all I can say is "Nope, never did anything that stupid! Mind if I tell my friends?"(Okay, that's one, there's room for 58 more, but remember, NOT 60 of us!)
Back to reality--hell, I can't even remember them all. Years ago, left my guitar, in its case, in my VW van parked on the street while I spent the evening in a bar. Came out to find the side door open, guitar and case gone. Then a couple years after that left my next guitar and case in the back seat of my car. Parked it on the street overnight. Next morning, broken window, guitar and case gone. Can you say "slow learner", boys and girls?
We take an annual 3-day canoe/camping trip on an Ozark river, carrying all our gear so we can camp overnight on the riverbank. One year one couple, who had been doing this with us for years, went through this exchange at the first night's camp:
"Honey, where did you pack the tent?"
"I thought you packed it."
"No, I didn't pack it, I thought you packed it."
They slept under a tarp on that trip. Fortunately, the weather made that a pleasant thing to do. Unfortunately, it's been over 5 years ago and I doubt they'll ever hear the end of it.
For your t-shirt--"I always know where my fiddle case is."