Respectfully disagreeing with kenji's opinion, the 2 times my curiosity has led me to eat at Mr. K's [pretty much across the street from me], I've found the food to be even more tired than the decor.
I'll second a rec for Super Cup at Lawrence & Central. Also to be considered is Blue Angel at Foster & Milwaukee [and you can get a movie, go to the dollar store or American Science & Surplus... what a strip mall!]. And if you want to drive a wee bit,
Kappy's at Harlem & Dempster tries much harder than your average diner to zip up the variations on the usual menu suspects.
Giovanna
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"Enjoy every sandwich."
-Warren Zevon