First message of today :
"Hi, I'm X from the Y office. Do you remember that was you to set up our internal network two months ago? Ok, yesterday we called the elettrician to fix two wall plugs. Now our network is completely broken. Come to fix because we think you did something wrong."

I forced myself into some other jobs i had to do for about 2 hours. After that i grab the smartphone to answer.

Oh look, there is another message.

"Hi, always X from the Y office. We just restored the static IPs you setup after we've changed them early this morning. Now everything works again."

Oh really ?