Hahaha! Ask to spar? Man you will get slapped up straight! I can see it now...it all goes quiet except for one or two sharp intakes of breath from disbelieving students...they all draw back and form a loose cicle... instructor gives a little laugh like "Ha!" before accepting...you square up and the bout begins....you throw a light jab and maybe a front snap kick then......WATAAAAAAAAHHHH!!!! He flys in with a spinning, hook kick to your head, Muay Thai clicnh for some Anderson Silva style knees to your Rich Franklin like nose, followed by a running, flying side kick to your ribs and it all ends with him jumping on your head and groin!
Here is what happened to the last guy: You are Bob Wall BTW!
http://www.youtube.com/watch?v=u1z7ELBVK6k