Scene: A person standing on a stage reciting a long story (or some other activity). A second person will enter at various stages and interrupt him, after which the story teller starts again.
The second person will need the following props: A briefcase, and a step ladder.
1. Person 2 walks on with a briefcase. First person asks him what he's doing. Reply: "I'm taking my case to court". Walks off.
2. Enters again with a step ladder. Same as before, this time replying: "I'm taking my case to a higher court"
3. This time, person two places the hands of the story teller in front of him, and puts his case on them. "I rest my case" (This one works best when the story teller doesn't know about it).
4. Final entry, without a case: "I lost my case"
This can of course be expanded. Seen in a variety show with many other things happening (mostly knock-knock jokes) in turn. Can be good when done properly.