Cueball: Hey, check it out: eπ−π is 19.999099979. That's weird. Black Hat: Yeah. That's how I got kicked out of the ACM in college. Cueball: ...what?
Black Hat: During a competition, I told the programmers on our team that eπ−π was a standard test of floating-point handlers -- it would come out to 20 unless they had rounding errors.
Cueball: That's awful. Black Hat: Yeah, they dug through half their algorithms looking for the bug before they figured it out.