Murphy's law is completely true.

Deployed my own software the very first time on a customer system on monday.

Today I'm at a job college class when my boss calls me: "...Hey yeah (unrelated) (yadda yadda) the software does not function for anyone").

I fucking knew it.
We don't have a proper project planning nor a real project manager/lead, we don't do QA, and now it's gone to shit.

I did my own testing extensively on monday & Tuesday, everything looked alright and worked like a charm.

I'm looking forward to the weekend already...