"You're like a weird genie!"
"You're like a slug... with knees"
"It's like a human-sized womb"
"You look like Jabba the Hut"
A YouTube channel called The Slow-Mo Guys made a video of one of the members inserting himself into a huge, human sized blowup water balloon, and filled it up until it popped.
And it's every bit as great as you hope.
The slow-mo replay of the popping is SO satisfying, beyond being really cool. And these guys are having a lot of fun with this thing, you can just tell.
Also, British accents.