Quote from Lorelai in Take the Deviled Eggs...
Lorelai: This must be the place. Rory: I think the balloons confirm it. Lorelai: No pink, no blue. Rory: All green. Lorelai: Aren't baby shower balloons supposed to reflect the sex of the baby? Blue for boys, pink for girls. Rory: You would think. Lorelai: What's green for, aliens? Rory: I'll ask when I go in.