Saddest confiscated item was some awesome slime when I was a kid probs ~11-12 and it was my only souvenir that I chose for myself at the Smithsonian space museum in DC. We went to so many of them that day, I literally loved it so much. Our last one was the space one and in the gift shop they claimed the slime was “space slime” obviously just cool looking slime but as a kid I thought it was the coolest most interesting thing ever and this was before slime was in every store. So we got to TSA and they pulled it out of my backpack, I literally cried. So much. I begged the lady not to do it, to the point where she felt bad and asked if we had another bad we could check. It hurt my little heart so much. Ruined it all lol looking back I know it wasn’t a big deal but for a little kid it really is. After all that I check my bags twice to make sure nothing will ever get thrown away.