Why people keep installing shit on their computers and then asks me if I can fix their PC that "randomly" stopped to run as fast as before?

If you, fucking retard, installed combos of 2 or sometimes even 3 antivirues, the worst ones by the way (e.g. Avast + Norton + Avira), some bullshit utilites like BoostMyFuckingPC 9000, SpeedMyGPU, etc. it's normal that it doesn't work, especially if you have a low end laptop with Intel i3 and 4 GB of RAM…

And it's not true I'm a magician if I make it work properly again, I just undone the fucking decisions you made when you started to search on bing how to increase FPS in LoL…

Fuck you, and fuck me because since we're friends/relatives I HAVE to help you little bastard.

My parents actually know pretty well what I do, my mum used to take a course on web-development.
But my grandparents ... they think I somehow 'talk' to the computer and make it do what I want it to ... may also be important to note that neither of them ever touched nor used a PC.

tl;dr: My grandparents think I am some kind of PC whisperer forcing PCs to do my bidding.