When security pulls you aside at the airport

Sir, did he just lick that last rock? I don't care if he says it's part of the identification process, I have new concerns

And if the rock(s) are too big at their discretion, they won't be going with you on your carry-on unfortunately.

It's all sedimentary, my good fellow!

“I just think they are neat…see…this one is warm when you touch it. ☺️”