Chairman of the Bored

At a party for Celebrity Gala of the Year, the Warners sneak in from under a table and start taking food from it. When Yakko goes out to get more cheeseballs he meets an icredibly boring person nicknamed Pip who keeps babling on to them throughout the night. They try to get away but he follows them home and when he finally leaves them alone the next morning they realize it's too quiet and want him to come back.