Changing in front of his family

"And now, watch me for the changes!" he continued as he was pointing the device at himself. And fizz!

Suddenly there was a bright flash, then a pink cloud formed around Walter, which then totally blocked everyone's view.
"Oh God. What's that smell!" Rebecca gagged, covering her nose.
"That's horrible, kinda smells like a beaver, I think." Jacob agreed.

Finally the smoke cleared and they saw...