Here's my Favorites list -
1) All the roleplaying Volpe's learning of the common tongue which lead to so many humorously confusing moments such as: Calling Hengin "Dinner", calling Iganeous "Dwarf" because he didn't bother to teach me his name, calling McGregor "Mac" because he was having a hard time teaching it to me and having someone behind me wonder outloud "Think I should teach Volpe to call him Big Mac?", and later having McGregor tell me that the name for Hengin's pouch was called "his stuff" thus causing so many other PCs to mightily object with "My Stuff!" whenever I referred to their pouches that way.
2) Standing "guard" over the other dwarf (Sorry, I forgot your In Character name!) and watching him get all worried about a nearby bandit.
3) Sticking my snout into Tac's conveniently positioned pouch while he was bending over and causing Jamina to burst into laughter.
4) Having Mara Glenbeck(Joy Nelson) rescue me in a nick of time while in the Frog Cave module. (Now that's being the hero!)
5) Getting away with calling the Barbarians "Barbies" and no one really noticing. (LOL!)
6) Ordering food (with some difficulties) from McGregor when Hengin brashly interrupts shooing me away before I paid.
7) Roleplaying Volpes' attempts to figure out why everyone seemed to be obsessed with collecting coins.
8) Having more than one person come rushing up to me and pantomime or ask me to refit their armor. (Volpe can't) But particularly some of the looks I got as I simply shook my head.
9) One of times I walked around the corner of the tavern by myself, spotting some NPCs & turning, pointing towards them and having a proverbial gaggle of adventurers go charging after them before I said anything.
10) And of course, getting into more than one staring match with an NPC as I sniffed them over and not getting killed for it!