Last time I flew was in June 2002.
After checking our luggage, I notice that I had left my Multi-tool in my pants pocket. I wasn't sure if it would be an issue but, as we were running a bit late, I didn't want to take a chance.
I slipped it out of my pocket and dropped it into a potted plant in a corner of the airport. Upon our return, 6 days later, I picked it back out of the same potted plant.
We laughed that, with all the security, nobody noticed the scruffy looking dude hanging out in the corner, diggin around in a plant