How to Tame a Tippy Table

In a Numberphile video, Matthias Kreck (University of Bonn) explains how to quickly stop annoying table wobble.

The problem is usually unevenness of the ground, Kreck says, not a defect in the table itself, and all it takes to stabilize the situation is some rotation. Don't buy it? Kreck gives a proof. Hint: It involves the mean value theorem.