By the way, I just looked at a script and the official line is "Hey, look out son, that's dangerous. You're gonna spill your beer."
That being said, here's my vote:
3 - Killing Scuzzlebutt in "Volcano"
2 - Teaching Stan how to hunt in "Volcano"
1 - "Hey, look out son, that's dangerous. You're gonna spill your beer." in "Volcano"
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"Anybody interested in grabbing a couple of burgers and hittin' the cemetery?" -Royal
"Oh sure, walk to the sun"- Guybrush