Those That Wake, a rather different version of Laura asks a rather different version of Mal to tell her a joke in order to alleviate some of the tension brought on by their situation. As those versions of Laura and Mal changed, the passage called less and less for a joke. But it's a good joke and I hate to see it go to waste, so here goes:
In an earlier version of
A wild turkey walks into a bar.
"Hey," says the bartender, "we've got a drink named after you."
And the wild turkey says "you've got a drink named Ralph?"