In the episode where the Simpsons get a pool and Bart breaks his leg and is spying on people with a telescope he scans many windows. In one of these windows you see Jimmy Stewart as L.B. Jefferies from the Hitchcock movie Rear Window. You see Jeff stare right at Bart and then say something like "Grace, come quick, there's a sinister looking boy over there"(and then he falls over I think). Anywho, he calls her "Grace" which is the name of the actress (Grace Kelly) who played the character he's talking to (Lisa Carol Fremont). All, I'm saying is he should have called her Lisa not Grace.