Alright I'll give this a go. I want the power to cause people to experience a sudden and intense psychedelic trip for several hours.
This sounds pretty silly, I know, but it could function pretty well. It would certainly be fairly incapacitating, the the villains or whoever would have a hard time describing me with the effects so my identity is safe, it is pretty harmless so I can go with a "I don't kill" kind of superhero persona. Plus, on my nights off, I can use it on myself and have a nice little evening.
I guess the danger would be that some of the people could freak out and run into traffic or something. However, if I was writing this as a character, I would probably make the "weakness" be that I can't direct the power so everyone in the room including the myself and any other bystanders end up tripping too.
If I had that power and was running with the superhero angle (as opposed to just being the super popular guy at the party angle), I would also drive a "hippied-out" van and wear a tie dye suit to go with my psychedelic abilities.
Interesting choice! Disabling people rather than a mastery over some physical property. It's hard to think of a real downside to this power, other than the choice of when to use it on people... Against villians the choice would be clearer than against otherwise harmless people!
The winners and the new question (I've told you how to do this before...) is here:
https://steemit.com/newbiegames/@bengy/steemitbasicincomegiveawayivetoldyouhowtodothisbefore-pb6n4om11j