Today our PM planned to deploy in production an e-commerce based on PrestaShop.
A colleague of mine mamaged to implement everything that was necessary, and I made a small script to add random sales on random products every sunday.
We tested it several times in our environment, on multiple machines, and everything was working fine.

BUT
Today we launched the script on production server, and we was a little mistake.
"A bug? Say no more pal, I'll fix it!".

Fixed, tested on local environment, deployed and.... The first steps weren't working.

"Fatal error".
That's what I got. No exceptions, no error messages, no references.. Just "fatal error".
We spent two hours looking for the problem, thinking it was a server error that was just outputting that shitty message.

And you know what? Some fucking fat cocksucker son of a bitch thought it was an excellent idea to stop the code execution with a simple and very helpful "fatal error".

"oh, wait, there is an error here, let me print die(" fatal error"), ao the other developer will be able to find what's going on", he thought.

FUCK YOU MORON.

TL;DR: Avoid French software, they are a bounch of asshole (except some goos guy..)