Since the name of the coin is Grumpycoin, I think maybe a good application would be to start using it to tip people with bad attitudes or negative comments on forums.
It would be an interesting dynamic because although people would technically be rewarded financially for being rude or pessimistic, the reward would come with a little bit of shame. It's like an oxymoron.
I don't know exactly how it would play out, but a whole bunch of interesting behavior and hopefully lighthearted joking negitivism and tipping could develop. It would be a lot of fun. Bizarro Doge.
I don't know how to start that or make a tipbot or whatever on Reddit, but if someone likes the idea and knows more about how to set it up, I will definitely use some of my grumpycoins to tip haters. Much more fun than downvoting, don't you think?