In college when we had programming labs where we had to use the schools unix server to compile and run.

My professor was very bad at explaining what actually needed to be done in the labs to the point where even the TAs didn't know what to do.

We were suppose to write an application in C to find out by "trial and error" how large we could make an array (or something like that, it's been too long). This not being explained well and no one knowing that much about C, I wrote a loop that just kept growing an array until it couldn't anymore. I watched it consume 72GB or memory from the servers before quitting the loop and realizing with the TA what the professor really meant.

I now feel bad for the IT staff monitoring the system wondering where 72GB just went...