I love mixing diff. kinds of weed in the same bowl/joint. There were times where I had 5 diff. strains of weed, snip up a tad of each, roll into one and smoke.

I remeber this one time though, me and 2 other buddies, we all had weed, from all diff. sources, so we decided to roll the 3 diff. kinds all into one. We didn't even finish the joint! There was black resin literally dripping off the mouthpiece. The other 2 guys put the joint out and said they were good, but hell, I could have kept fucking going!