I accidentally did crack once. My best friend was coming off a crack addiction and we were using her stem to smoke some pot out of. Turns out she left a rock of crack in there. When I kicked the pot I lit it again and took a huge hit.
Never do it again though.
We also have this one friend who whenever she smokes salvia she goes into this ocean world and swims on the floor for 20 minutes. Then she comes half back to reality and tells us the same story about fish and water and seaweed and how it was "sooooo pretty". A few minutes later she's sober and doesn't remember any of it. This one time though she went into the movie fantasia and we called her cell phone and she picked it up and we were talking to her and she was telling us about it. That was majorly weird.