Okay, a bit technical this one and the Genie will have to earn his corn;
Basically from the moment the wish is granted if you at any point anyone starts behaving like a dick, you get a gut punch.
The level of the punch is proportional to the constitution of the recipient and the gravity of the offence (so if you drop some litter you get a stiff jab, if you hit and animal you get a Mike Tyson body hook).
After you get whacked a sigh appears over your head that lasts for a period again proportional to the offence that says;
"DICK" - so everyone knows you've been a dick.
Come on Genie you're out there let's do this and not be a dick!