Also, do standing on one's head. Perform very easily, as in Dave said he could do the income tax return blindfolded, or An excellent carpenter, he could do just about anything standing on his head. For a synonymous hyperbolic expression, see with one arm tied.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.