It seems to me that the only thing you have learned is that Caesar is a salad dressing dude.
10 seconds sound clip from the Bill & Ted's Excellent Adventure movie soundboard.
You can hear this line at 00:06:23 in the Blu-ray version of the movie.
Quote context
[...]
- We have, uh... We've learned that the world has a great history.
- It seems to me that the only thing you have learned is that Caesar is a salad dressing dude.
- Bill, Ted, this is really quite simple. You have flunked every section of this class.
- OK. Guys. Your report had better be something very special.
[...]