Happy Twentieth - S2.E18

When Lester decides to rent a hotel room for the weekend, Mary plans a cruise, and the ladies plan a surprise party for Mary and Lester's Anniversary, it's all Brenda can take to keep it a secret. She decides to tell them what the other's are planning for the weekend and they all agree to the party.

When Lester and Mary's parents arrive they argue about everything. Lester ends up getting sick and the party ends up being cancelled. Lester and Mary decide to take a cruise later on to celebrate the anniversary.