Having to portray somebody who will take their shirt off (with chest hair) and drink wine for "fun..."
Explanation:
Lord Farquaad, in one scene of Shreck, was at least half naked, waist up, and in bed with a wine glass with red wine. I think it would be a unique challenge to have to do this and then somebody rips your blanket off to determine whether you are "waist-up" naked, "waist-down" naked, or "whole-body" naked.
But the most unusual challenge is that his character is only 4 feet tall, while the actor stands 5 feet, 10 inches. To portray Lord Farquaad, Dibble wears custom-made knee pads and is actually on his knees throughout the play. The audience doesn't see this because his legs are hidden.
