I think you need to reevaluate what you consider 'valuables'.
flatscreens and ps4s are expensive. Nephews you can get for $25 from any local slut on the street.
I started to laugh because I thought you meant the PS hit the kid in the face, but then I realized you meant the TV and PS fell. Sucks, man.
Meh. I would have found it funny if he'd yanked the cord and hit HIMSELF in the face with the PS too. I'm an equal opportunity sadist. No shame.
Out of curiosity, how did you think yanking something out of a four-year-old's hands was going to go? Because in my experience, it was going to involve sobbing, kicking, grabbing for it back, and a generally miserable time.
I get that it's your nephew not your kid but it's not rocket science that you redirect kids away from what they shouldn't have (but isn't dangerous), not try to snatch it out of their hands.
You kind of deserved this. Instead of instantly ripping things out of their hands, redirect their attention or tell them no. They're four, not four months. So, unless they have some sort of disability, they should understand no. Or don't put things out when they visit that they will want to play with.
Your priorities suck.
'In attempt to keep my valuables safe'... Nah, you just didn't want to share.
I think you need to reevaluate what you consider 'valuables'.