I saw this story on the debugging section of Anecdota and thought it was funny, though I find it hard to believe.
Laptop warmer
In 1998, I made a C++ program to calculate pi to a billion digits. I coded it on my laptop (Pentium 2 I think) and then ran the program. The next day I got a new laptop but decided to keep the program running. It’s been over seven years now since I ran it. and this morning it finished calculating. The output:
“THE VALUE OF PI TO THE BILLIONTH DIGIT IS = ”
Mindblowing eh? I looked in the code...