This is how Stu Pickles makes the Reptar Wagon in Weekenders Adventures of The Rugrats Movie.
(Cut to basement, where Stu and Drew are arguing.)
Drew: Good for nothing!
Both: Why can't you listen to me?!
Drew: We're talking about a real job, Stu, with benefits.
Stu: I'm not going to waste my life as a clock-punching, paper-pushing, bean-counting... Oh, no, offense.
(Stu proceeds to weld.)
Drew: You barely make ends meet now. You've got no insurance, no savings, and another kid on the way!
Stu: For your information, bro, I am working on something right now that is going to put this branch of the Pickles family on Easy Street.
Drew: What is it this time, huh, an electric sponge?
Stu: Of course not! That was last year. (reveals a skeleton of the Reptar Wagon) This, this is the Reptar Wagon! The ultimate in toddler transportation. The perfect children's toy!
(Grandpa fixes an old radio as he talks.)
Grandpa: In my day, we had plenty of fun just throwin' rocks at each other. Big bag of dirt clods, that's what the kids want.
Stu: The Reptar Corporation is holding a toy design contestM and the winner gets $500!
Drew: (sarcastically) Ooh!
Stu: And there'll be plenty more if this toy's a hit, and I'll be famous!
Drew: Oh, yeah, yeah, yeah. That's what you said when you built that stupid thing.
(Drew points to a Dactar glider, which is suspended from the ceiling.)
Stu: Maybe Dactar was a little...complex, but... this... this...watch! (speaking into microphone, in normal voice) I am Reptar! Hear me roar!
Reptar Wagon: (Stu's voice, distorted) I am Reptar! Here me roar!
(The Reptar Wagon spits fire.)
Grandpa: Dang-flabbit! Can't a man work in his own basement without gettin' barbecued?
Stu: Okay, so maybe real fire isn't the best idea for a children's toy.
(Drew's shirt is smoldering; Stu sprays Drew with the fire extinguisher.)