This show is such a treasure trove of these I can't even pick one or two favorites:http://perfectstrangers.tv/balkiisms.htm
Although I am partial to, "When we go first class we eat the whole hog!"
And "You think I have ESPN?"
"I don't think he's playing with a full deck chair."
"Balki has his thinking cap pulled way down over his ears."
"Cousin Larry is my tormentor." (He was looking for the word "mentor" but, if you know their relationship
"...with both eyes tied behind his back"
"This could be it. Keep your eyes crossed."
"You just burst my baboon." (Although I think that one is a little forced, in the sense that I don't know if a real person, even one unfamiliar with the language, would confuse those words.)
And, from Roald Dahl's The BFG: "You is barking up the wrong dog."