Statistical Inception

A formula inside of a formula inside of a formula inside of another formula

Bob: Wow I have to use a stupid formula to find the test statistic for a sample size of n, but in order to do that I have to find SE(y) which is s divided by the square root n and in order to find that I have to find s. But, in order to find s i have to calculate the sample mean...

Jim: Damn that sounds like Statistical Inception!