Couldn't have been Yogi. He's up there giving a ski lesson.
5 seconds sound clip from the Yogi's First Christmas (1980) movie soundboard.
You can hear this line at 00:46:10 in the Blu-ray version of the movie.
Quote context
[...]
- I'll pull the plug on this silly ski lift.
- But I'm sure the ranger will fix the motor.
- Where is that ranger? Yoo-hoo! Mr. Ranger?
- Well, I doused that smoke pot. Someone's idea of a joke.
- Couldn't have been Yogi. He's up there giving a ski lesson.
- Oh, no, the chairs have stopped.
- Sit tight, ma'am. I'll have you out of there in a jiffy.
- Something must have happened to the motor.
[...]