Oh man... ME language has been so integrated in my normal speech that I seldom even notice it anymore! (scary huh).
I randomly will call things "preciousssssss."
When someone asks me where we're going... "to Rivendell, Master Gamgee... to the house of Elrond."
When I'm exasperated, inevidably I'll say "Aiya Earendil!"
In an area that is too overbuilt: "They need more gardens, the houses are dead."
Whenever we're by a beach: "Alas! for the gulls. No peace shall I have again under beech or under elm."
When someone is really aggravating me.... "Stuupid, faattt, hobbit!"
I too will often say "Poh-tay-toes!"
When I don't want to go somewhere: "I do not wish to go into the mines."
I talk to my dog in Elvish and Rohirric, yeah I'm slightly crazy, but "faeste, stille nu" calms him much better than simply telling him to settle down. When he gets scared, or when he's hyper-alert about something, "Man le trasta."
When riding horses at the stable, I would often say "Noro lim!"
I use misc. Elvish phrases for different situations in everyday life... mae govannem, hannon le, man le trasta, man cenich, be eist lin, lasto beth nin, havo dad, losto, sedho hodo. the list goes on and on........
When there's a car approaching me and whomever I'm with: "Get off the road!"
I too use the Frodo-accent "You're late!"
Randomly I'll call out "Nedin dagor hen u-erir otheri. Natha daged dhaer!" you get most interesting reactions from nearby "normals" when you do that,
or randomly start singing the Lay of Luthien.
The list goes ever on and on..........
-Elrowen