You may have wondered when Ted asks Bill if he's ever made a mushroom out of Washington's head just what he's talking about!  Well, here's the secret!

Take a United States one dollar bill featuring
the Father of Our Country:

Fold it in half so that only the top portion of
Washingtons' head is showing:

Make a second fold in the opposite direction just
below Washington's chin, so the bill folds into itself
(you may want to do this at a slight angle for the best effect):

Push the upper and lower halves together with the double fold
hidden in the middle (like those Mad Magazine pages you fold in to
make a picture).  And there you have it . . . a mushroom!