I've thought about some of my favorite lines. My choices are:
"Tomorrow Is Another Day" from Gone With The Wind
"I'll Have What She's Having" from When Harry Met Sally
"If You Build It, They Will Come" from Field of Dreams
"You Never Know What You're Gonna Get" from Forrest Gump
"Double The Pleasure, Double The Fun"
"Two Buns In The Oven"
"Two Peas In A Pod"
Also, opinions/ideas are very welcome...