What's one thing that makes you reach out to a startup showcasing their product at a tech event?

We've been invited to take part in our first physical event to showcase Lifetoon with a stand - Bucharest Tech Week.

We're already preparing some must-haves (stickers, roll-up, demo), but I'm curious to find the things that make a startup stand out for you at events. I know things that can be consumed (coffee, sweets) attract people, but I'd love to find out about other things that caught your eye while exploring the startup area at bigger events.

What made you go "Wow, I have to check this startup out"?