As far as Gregory knows, anything medicated is good—a sign of his innocence and inexperience. The scene becomes even funnier with the revelation that Gregory just smeared too much mentholated VapoRub on his lips, especially when Joey shares his reasoning for choosing to bring VapoRub. The point, he reasons, is to make one’s lips “greasy”—but as Gregory’s tears suggest, that’s not actually the goal of lip balm, and using it shouldn’t make a person cry. This comedy of errors is funny, but the situation again emphasizes that Gregory’s friends are fully committed to helping him. They’re not experienced with romance themselves, though, so their advice is perhaps not the best.