Well, let's see:
Friday evening: "I worked all day. I am tired. I deserve a treat".
"I am bored. Let's eat."
"I want to see my friends. Let's go out to eat."
"I am cold. Let's eat pasta."
"I am hot. Let's eat ice cream."
....

Never ending unfortunately.

Great post! I have an entire arsenal of excuses:
"It's a family meal--pass the mashed potatoes." (Too bad there are always four days of leftovers).
"It's just one {fill in blank here}. One won't hurt." (Six days straight of "just ones" later...)
"I'm tired/upset/had a bad day/have too much grading to do and I don't want to cook a real meal." *cue dialing finger for Dominoes*

Love the concept of looking ahead, not back.