"Oh, Lord!" he yelled.
"Please keep your voice down," the clerk said desperately. "It's bad enough what you're doing, without yelling about it. If this is some advertising stunt...."
"Keep my voice down?" Marc said unhappily. "I can't even keep myself down!"
"It's the explosion!" Toffee cried with sudden realization. "All that stuff floating around in the basement! Now you're doing it, too!"
"Oh, my God!" Marc cried. The exclamation was prompted simultaneously by the terrible realization of his condition and the fact that even while they had been talking he had risen an additional foot into the air.
"I'm going higher!"
The clerk steadied himself uncertainly against the counter. "Please, sir!" he quavered. "You'll have to stop that at once. I'll give you a room, a whole floor, if you'll only stop!"
"You shut up, you quivering ninny," Marc gritted. "Do you think I actually want to do this sort of thing?"
"I don't know," the clerk said uncertainly. "I can't think why you should. I'm sure I'd hate it myself."