Venues allow customers to "pay what they want" for a beer until the keg runs dry. Of course, someone could take advantage of the offer and drink approximately 150 beers for free, but that would definitely bring about bad karma. The Karma Keg is based on the 'what goes around comes around' principle and proceeds from the keg go to the venue owner's chosen charity.
Other venues place a minimum amount on a beer ensuring that a fair price is paid for a cold one.
On the whole, it appears that Australians are generous with most people paying a fair amount. Maybe the fear of getting hit by bad Karma is enough to make people pay up.
With corporate social responsibility becoming more important, some of the big brewers are getting involved by donating the kegs to local venues.
So where in Melbourne can you find a Karma Keg and when are they held? Well 5pm on a Friday seems to be the usual time and the following all offer a feel good beer: