The Pep Boys matchbook with red tipped dongs that elongate by moving the back.
I grew up with Land o Lakes butter, and I never heard of this before. Such a sheltered life, no boobs with my breakfast…
Isn’t there also a way to do so with just folding the container? I could have sworn that’s how my dad showed it to my sister and our cousin.
Yeah. Here’a a short video of the process.
Not only have I heard of this, but back in junior high, my English teacher would give the Land O’ Lakes award to the girl whose boobs had grown the most over the course of the school year.
I wish I were kidding.
I am assuming that your teacher was female.
Nope.
He was later fired for some untoward student-teacher activities on school ski trips.
Really? Whodathunk?
When informed that the young female had breast enhancement surgery over summer vacation, he cried, “I can’t believe they’re not butter!” 
Butter!
This reminds me of an advertising campaign in NZ many years ago.
The tagline was Butter - good for your buns
The image - two round buns, one resting on the other to form something like a pair of buttocks, and a roundtipped knife, tip loaded with butter, making an approach.
I nearly choked the first time I saw it. My wife never understood why it always made me crack up. I wasn’t up to explaining.
Si
See, he was just carrying on the tradition. Immigration officials used to show it to all the new arrivals at Ellis Island.
“And now we will show you the kind of sense of humor your new co-Americans will have…”