Background: Got a macbook, A external HDD(2TB) of which +- 1TB was used.

Yesterday i moved all my personal projects from my work laptop to my external, to move to my macbook.
One of my clients(Freelancing) calls asking me to install new hardware, install software and fix OS(Windows 8.1).
I leave work and go directly to said client and he hands over his Lenovo S20 Touch(No CD/DVD Drive).
I install windows 10 and other software from my flash(Already on there)

Good, Everything is ready to go. I go home and finally get to sit down with my baby(MacBook)

Me: *Plugs in external*
...
nothing.
Opens Finder, can't find flashdrive
Check MacKeeper
MacKeeper: VirusDetected
Me: *Pissed*

Client calls.
Client: Hey is everything ok with the laptop, no viruses no nothing. Because everytime i insert a flashdrive it gets a virus and i have to buy a new one.

Me: I installed windows 10 on it, it should be fine with defender now.

Heart: *shattered* YOU COULD'VE TOLD ME THAT BEFORE FUCKER!!

i never knew people like this still exist