I can HIGHLY recommend brownie batter put into non-standard pans. Madeline pans make excellent bite sized brownies, and cupcakes are good too. Just don’t put too much into each one, otherwise the center doesn't bake and achieve the desired gooey texture.
Speaking from an American POV, that's probably because parents would still rather commit seppuku than be open about human sexuality because they are prudes and cowards. Gratefully my parents weren't that way but my friends weren't so lucky.
A spherical tray should work. Make sure it has enough mass to make its gravitational field hold on to the batter and suspend it in the oven using magnets.
Panko bread dough is placed between two metal surfaces, and is cooked by running an electric current through it. This avoids any crust forming, causing it to be very uniform.
I suppose you could bake a brownie sphere in microgravity. That might be hard to get the center cooked without burning the surface though. Maybe a metal ball as a pan that you could coat with batter.
I'm familiar with edging, but I'm not sure I see the joke. That might be because "edge" feels somewhat semantically separate to "edging" in my mind. As a clearer example of what I mean, if the word "edgy" came up, I would be way more likely to think of it as describing someone or something that tries too hard to be dark and provocative. I'd be very confused if someone used "edgy" as an adjectivified form of "edging".
Besides that though, I'm sure that edging was a thing 15 years ago; the Wikipedia article for "edging(sexual practice)" dates back to 2006, for one. Part of why I didn't get the joke is because I can't think of any logical link between edging and 15 years ago, so I think I concluded that the meme wasn't about the sex thing.
Is there still something I'm missing, or am I just being supremely autistic about this?
What there's loads to do. You can awkwardly try not to touch the person next to you. You can hold it, because you're stuck in the middle or window, and you don't want to disturb the person next to you. You can drink the 2 oz of diet Coke they give you before they bring you peanuts, then desperately try to suck any amount of liquid out of the cup of ice you're left with. You can try to get to your bag under the seat in front of you, fail because your feet are in the way, and spend the rest of the flight wishing you hadn't done that.