The inventors' fair

"Should we then talk about participating in the next inventors' fair?"
Uh oh. Peter already knew these strange feelings from his father! Whenever Walter thought that he had invented something great, he and Tim went to the next inventors' fair to present his discovery with his own booth. So far, however, it had always been a failure!
"Clear!" said Peter and quickly left.
A few hours later, father and son were sitting together in the basement laboratory.
"Son, I think that's the breakthrough this time!".
"Do you believe?" chuckled Tim.
"Yes! Tim, this invention will revolutionize cosmetic surgery, no more expensive silicone! Sex reassignment at the push of a button, and getting old is a nightmare from yesterday! Now I just have to sell the whole thing ...".
"Hm ... Dad, do you remember the fair babes at the last E3?".
Of course Walter still knew what he meant. Peter dragged him to E3 last year, where thanks to his teenage hormones, they had to go to every booth to get a close look at the hostesses in cosplay.
"Yes what's up with it?".
"Well, with a hot fair hottie your invention could hit like a grenade!".
"Oh, there is something to it! Just what it costs again ..." thought Walter - and paused because he had to look at the iBod ...