David's polystyrene Mount Rushmore
Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!
David cut holes out of a polystyrene wall he had painted grey, next to a sign saying 'Mount Rushmore Parking', and some plants. He then painted his and several members of the production crew's faces grey, and they poked them through the holes.
(Written by Taskmaster Wiki contributors)