If memory serves, there may already be a thread about Young Indy quotes but I'm not going to bother checking...
There are bucketloads of great ones throughout all of the episodes. Some of my favourites from "Phantom Train":
To Selous in the car, while hanging onto the balloon for dear life:
Indy: I GOT SIDETRACKED!
The balloon sinking in front of the advancing Germans:
Remy: We are too heavy! We must lose some weight!
Von Lettow (smugly): I suggest diet and exercise.
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Perhaps the most nostalgic quote, for me, is from Mexico:
Indy: I'm definitely going to miss high school...
This came just before the 1st commercial break in the Flanery segment of the "Curse of the Jackal" premiere
so the line always reminds me of the cliff-hanger experience...waiting for the show to come back on!