Obstruction/Interference clinic materials

[Andy]

I am presenting a two-hour (approx) clinic on Interference and Obstruction for HS umpires in about a week. I will have access to a computer, projector, etc.

Do any of you have or know of any video available that would show obstruction and/or interference plays?

I'm going to cover rulebook definitions and case plays, but having actual visual plays would help as well.

My personal feeling is that obstruction does not get called often enough and most umpires aren't looking for it or recognizing it.

If you want to shoot me a PM or respond here, that would be great. Thanks