My group of friends recently came up with a "safe word", at the request of one member, let's call her M. The idea is that whenever someone is uncomfortable with the subject our group is discussing, they call out the safe word and we change the subject to something less problematic. It was done pretty reluctantly on the part of most of us, but M insisted it was really important so everyone will be comfortable.
It's predictably stupid. It's even stupider because no one uses the safe word apart from M. We basically can't talk about politics or have proper conversations about the good and bad points of her favorite movies and TV shows because M has no backbone. I think it's worth mentioning she's very active on Tumblr and somewhere on the autism spectrum.