I ran ran across this video clip of Johnny Cash and Steve Martin.  It must be in the late 70's around the time of "The Jerk".I knew it wasn't the "Johnny Cash Show" because that ended around 1971 so it must have been on a special of some sort.   It's classic Steve Martin from the SNL days and the look on the little girl is priceless.

Now you're probably wondering what Johnny Cash and Steve Martin could possibly have in common. Well, more than you'd think.  Steve Martin is a very accomplished banjo player and had played the Grand Ole Opry and toured with his Bluegrass Band.

Here he is on "Letterman" with the legendary Earl Scruggs performing the "Foggy Mountain Breakdown".