When the Griswolds need to win their money back Mrs. Griswold gives Clark $2 and directs the family into the Luxor Casino (the giant lion-shaped building) to play Keno. When the old man next to them (played by Sid Ceasar) dies and drops his winning ticket on the floor Clark rescues the ticket from a passing vacuum cleaner. The side of the vacuum says MGM Grand but they walked into the Luxor.