I went to a client’s office to install some apps for a telemarketing platform they wanted on their server.

Me: How can I put the apps in your server? Would a flash drive work?

Client: Sure, bring them on a flash drive and plug them on the external contractor’s PC so I can transfer them to the server where you’ll install them

I went there the next day and plugged the flash drive, nothing happened, so I went to Client and asked him about it.

Client: Oh, security blocked all our USB ports and CD readers on our PCs, you may have to download it from the webpage instead

The webpage was blocked, as well as almost everything. 

Client: That’s bad, just send them to me through email.

And that’s how the Client and I learned that any mail that’s not from @client.com will have their attachments purged, no matter the file extension.

There’s security, and then there’s THIS.

Source: Clients from Hell