Hank and the guys go golfing. Bobby loses his grip on his club and the club hits Willie Nelson in the head. Bobby later runs into Willie…

WILLIE NELSON: Hey, I know you. You’re the kid that rakes my lawn.
BOBBY: No, I’m the kid who hit you in the head.
WILLIE NELSON: With a rake?
BOBBY: No, with a golf club.
WILLIE NELSON: You been raking my lawn with a golf club? I want my quarter back.

…

BOBBY: Dad, guess where I am?
HANK: Oh, I dunno, let’s see, crushing Dwight Yoakam’s voice box with my five iron?
BOBBY: I’m at Willie Nelson’s, and he wants you to come over!
HANK: Son, you’re teasing the gorilla in the monkey house.

(In case you’re wondering, I found the quotes at http://www.geocities.com/arlen_texas/willies.htm.)

On a Dwight Yoakam-related note, Dwight Yoakam provided the voice for recurring King of the Hill character, Lane Pratley, in “Nine Pretty Darn Angry Men,” although later appearances were voiced by someone other than Dwight.

King of the Hill has featured many celebrity voices such as the late John Ritter, Trace Adkins, Johnny Knoxville, Tammy Wynette, Betty White, Charlie Daniels, and Reese Witherspoon just to name a few.