I imagine they find Liz's baby, need to do DNA test to determine it is hers and walla they discover Lucky is the father.
Lucky is then on the Maury Povich show. "You are the father!"
Does lucky slice onions before every scene?
Epiphany
(seriously I think it will be Robin on the rebound from a philandering Patrick)
"Oops."
Whatever his line is, there will be a pause as Maurice Bernard tries to remember his line.