- Keenan is a student of Brazilian jiu-jitsu. He once put a stage-rushing fan in a rear-naked choke, while in the middle of singing a song, and held him down without missing a note until security finally took him away.
- Here's the video of said incident.
- The song "Lateralus" is often hailed as one of the crowning jewels of not just Tool's Discography ,but of the best songs ever. The most interesting and creative aspect of the song is the usage of the Fibonacci sequence (a very difficult but interesting sequence of numbers), which is not just incorporated within it's Time signatures, but in the opening and chorus. Now that's creativity and awesomeness to boot.