"What Is "Pi"?" joke

Mathematician: Pi is the ratio of the circumference of a circle to its diameter.
Engineer: Pi is about 22/7.
Physicist: Pi is 3. 14159 plus or minus 0. 000005
Computer Programmer: Pi is 3. 141592653589 in double precision.
Nutritionist: You one track math-minded fellows, Pie is a healthy and delicious dessert!