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?
I have a fair amount of crap, but not a lot of it is of much interest to most people.
Unless someone out there wants me to show up with a laundry basket full of Fumos and subject them to an unsolicited three hour lecture on Touhou lore...
Collectible marketable plushies of anime girls from a very specific franchise. Have a bit of a meme cult following. Both the franchise itself as a whole and this product line in specific.
Google will show you what they look like, and /r/fumofumo on Reddit has a collection of memes and shitposts to see, but if you don't get the appeal that wouldn't be surprising.