Best bug I helped find was a flaw in some FPGA code for a special DAQ board for a muon detector I was building. When the board was in a temperature above about 74F, the FPGA would often (but not always) fail to initiate some ADCs correctly because some delays would cause part of the circuit to go out of sync, and when it was below, it always worked fine. So, testing in the office worked fine, but running the board outside wit a slightly different setup in the summer would mean a failure, but not always.
The horrible part was after all this, I had to wire up a bunch of NIM modules instead with all the special logic (coincidence/anti-coincidence triggers + a bunch of other stuff so I could have separate binned energy counters) and then calibration manually because the engineer for that board was busy with other things to fix the bug.
I would have loved to tell this story at an interview for a job, except I could almost never get past HR drones, probably because my degree said physics and not CS or EE.
The horrible part was after all this, I had to wire up a bunch of NIM modules instead with all the special logic (coincidence/anti-coincidence triggers + a bunch of other stuff so I could have separate binned energy counters) and then calibration manually because the engineer for that board was busy with other things to fix the bug.
I would have loved to tell this story at an interview for a job, except I could almost never get past HR drones, probably because my degree said physics and not CS or EE.