Expand Your Mind

See? Told you I was starting with an easy one. Gotta hook you in, first, then whammy you. Fear not, I promise there will be a nice distribution between easy ones, hard ones, and ones that just make you groan. ;)

Congratulations to almost everyone that answered yesterday for getting it right. The answer, of course, was to let a little bit of air out of the tires, thereby lowering the truck just a tad, so it could be driven out from under the overpass. Now, for today's:
Dee Septor, the famous magician, announced that, without the aid of any equipment, he would walk on the surface of the lake. The following Sunday, a crowd came out and witnessed Dee Septor do exactly as he promised. How could he manage this feat without the aid of any special equipment?
Is it magic?