Boring -- it's a core class -- Excel with financial applications. Yesterday we were doing the formulas to compute how much one would need to save for retirement at age 65 to maintain a decent lifestyle. I came to the conclusion that I don't have enough in my retirement account yet. I was trying to lighten things up by saying, "Well, guess I'll be a bag lady living under one of the overpasses on the 75/85 connector in downtown Atlanta. (People actually live there). One of the kids jokingly said, "Yeah, you'd probably be on crack, too." I said, "I don't need crack -- I already act like I'm on it, although I wouldn't know what it looks like if I saw it."
They thought it was hilarious. Kinda broke the boredom from looking at the formula
PV=R(1-(1+i)^-n)/i
where PV is the amount you need to have saved by retirement
R is how much your periodic retirement check will be
i is the periodic interest rate
and n is how many checks you think you'll need before you die!
(This can also be done using the Excel PV formula).
TMI.