Nothing happened.
"Obviously nothing would really happen," he said to himself, disdainfully. He felt silly and didn't want to admit that part of him had really expected this to work.
"Ah well," he said to himself. "Like Mom & Dad always said, 'If at first you don't succeed, try again the next day'."
He left the lab and went upstairs to the living room, to watch tv.
"I guess It coulda been a major breakthrough with sizes." he said. "It' bet it'd make people shrink, or anythi-"
POOF!
Jonathan vanished into thin air!
His clothes immediately fell into a heap on the ground, as if it was a cheap magic trick.
Immediately, a lump fought through the giant CLOTHES - it was Jonathan!
He emerged, stark naked as the day he was born, from his GIANT clothes.
HE SAW HOW HUGE THE LIVING ROOM WAS.
"holy shit!" Jonathan exlaimed. "i'VE SHRUNK!"
"I need to grow bigger again!" he said.
Immediately, Jonathan grew right back to normal size.
"WOw!" he said. "It worked!"
and he noticed he was naked. He put his clothes back on, and ran a test with his dna scanner in his lab.
He realized he'd gained the power to change size!
"HOLY SHIT!" Jonathan exclaimed. "I've got SUPERPOWERS!!!!"
Indeed!