"I think thats good." Nate turns the valve on the helium tank and you feel the air stop entering you. The pressure is tremendous, your head feels like its going to explode.
Looking forward you see your nose extending slowly in front of you, round and smooth made of shiny brown latex. Your mouth seals shut as your face turns fully in to a donkey snout and your head becomes completely balloon.
"We are arent high enough. I gotta get rid of this weight! Haaaw!" Nate throws the helium tank overboard and it crashes to the ground with a loud clang. You feel the wind rushing past you as you begin to ascend and your hands and feet below you become inflated hooves, you are now completely a donkey, though about 4 times the size of a regular donkey and clearly not your garden variety. You wont be seeing any balloon donkeys on a farm.
"Hey the balloon seller guy looks pissed. Check him out. Hey. Oh. You probably cant move anymore huh? Sorry about that. I'll find a way to change you back when we escape I promise." Nate explains as he points to the balloon seller on the ground below you. He is a good 200 feet away now, and the wind is carrying you further but you see him gesturing at you, no at Nate. What is he doing you wonder.
Nate laughs and sits back in the trashcan beneath your inflated belly to enjoy the ride.
"What the hell!?" Nate yells...