A guy buys his first motorcycle. The dealer tells him to keep a jar of Vaseline handy to rub on the chrome before it rains to prevent rusting.
A few months later, the young man's girlfriend invites him to dinner at her parents' house. Before they go in, she explains their family tradition that whomever speaks first after dinner must do the dishes.
After dinner, everyone sits in silence waiting for the first person to break. After 15 minutes, the young man decides to speed things up. He leans over and kisses his woman in front of her family. No one says a word.
Emboldened, he throws her on the table and has sex with her. Silence. Desperate, he grabs her mother and has sex with her on the table.
Suddenly, they hear thunder rumble in the distance. The guy thinks of his bike and, instinctively, pulls the jar of Vaseline out of his pocket.
"OK, OK," says the father, "I'll do the dishes!"