Love and Taxis

"When two people love each other, they come together --Wham!--  like two taxis on Broadway."
Stella (Thelma Ritter), Rear Window (Collector's Edition)

Cash Only

"People don't commit murder on credit."
Tom Wendice (Ray Milland), Dial M for Murder

A "Little" Mad

"We all go a little mad sometimes."
Norman Bates (Anthony Perkins), Psycho (Collector's Edition)