What is the worst experience you had running a wordpress website?

I experienced a time when my site started getting traffic and suddenly it got hacked. It was so frustrating and after cleaning it. It was tagged as a malicious site on google and I had a hard time getting back that traffic. I've learned a lesson to maintain my site properly and always backup my files!

If you have any nightmares or bad experiences with a WordPress site, kindly share it :)