One of my favorite moments in the entire LBT series was in The Secret of Saurus Rock, when the Allosaurus had just thrown the log across the ditch. The whole conversation the gang had, wondering if they were in its tummy, and Petrie saying "me no know, but it STILL DARK in herree..." cracked me up. There were a few other moments in the movie that had me laughing, such as the (paraphrased) dialogue between Petrie and Ducky:
"No worry, if you fall there little river waaay down there that you might land in. Maybe."
(Ducky, sarcastically) "Oh, THANK YOU, I feel SO much better now!"
The humor seemed so natural in that movie.
Anyway, I planned on making a video of my favorite moments in the LBT TV series, but I haven't figured out Windows Movie Maker or whatever - it keeps crashing on me.