In the new 2015 SXSW edition of "Pot Quiz," Willie Nelson makes a surprise guest appearance as the "highest musician in the world."

From time to time back home in L.A., we ask pot smokers what they know about a variety of subjects. We thought it might be fun to try it in Austin as well.

Austin's favorite Matthew McConaughey also made a surprise appearance with Kimmel, which you can catch here!