Haven't used pie since I gave up Engineering.3.1415926 ; all I need for my daily life
On a related side note: another number I will never forget: 1 mole
6.022x10^23
My teacher always asked: what is the weight of 1 mole eggs? I never figured out.
Oh, and of course: Happy Pie Day to Dr. Q and all others.
Haven't eaten one since 2015.