I don't necessarily mean adult as in NSFW.
I'd probably bring in my RG280V. It was my first handheld emulator. I had emulated games on my phone in the past and even used a Bluetooth controller but playing on it felt different. More real in a way.
I grew up with the Game Boy so the idea of having thousands of games on the go is pretty neat to me.
I've since moved on to the RG405M.
What about you? Do you have anything neat or special to you that you could talk about for a couple minutes?
Would love to see photos as well
Depends, is it a casual thing or more serious? If it's casual I'd probably just bring a Trading Card Game deck (MTG, YuGiOh, Pokémon). If it's more serious, I'd bring in some of my junk like a broken microwave magnetron, to simultaneously bring attention to the problem of short product cycles, explain a bit about how what most people see as a magic appliance functions, and show that even complex things can be broken down into simple parts.