That's a classic Cheech and Chong line: "You've won a blind date with Stevie Wonder!"
More C&C:
Cheech: Hey, whatcha smokin', man?
Chong: Oh, it's Maui Wowie with a little bit of Labrador.
Cheech: Labrador? What's that?
Chong: Oh, my dog ate my stash and I had to follow him around for a week to get it all back.
Cheech: Man, we're smoking dog sh!t!!!!!
Chong: Yeah, how is it?
Cheech: Oh, not bad man!!