Roger Apery, a French mathematician most remembered for proving that $\zeta(3)\in\mathbb{R}\setminus\mathbb{Q}$ (irrational) in $1979$. In this video posted by Numberphile: https://www.youtube.com/watch?v=ur-iLy4z3QE the person in the video briefly stated that during a seminar for which Apery unexpectedly proved the irrationality of $\zeta(3)$, mathematicians who attended that seminar asked him about how he came up with his binomial expansion of $\zeta(3)$, he replied:

"Oh they grow in my garden"

I do acknowledge the sense of humor that Apery had but what did he really meant/implied by his reply?