You should be fine if you just tell him what you think of his behavior. Because from your description of him he just seems to take jokes a little bit too far so pointing out his very frustrating/annoying behavior should cause him to either cease with the behavior or at least exhibit it less often while you are present. Though other than that he sounds like a normal minded person (maybe a little annoying now and then, but normal) so no, he won't pick up a drill and start a murdering everyone in sight.
Though as far as video games effecting someone enough to make them physically harm another person, I believe they can. A person who goes out and harms another human intentionally is generally unsound (often times in more ways than one) and was just waiting for a catalyst to trigger them. Which a video game can very well be such a catalyst for such unsound individuals, though a video game itself cannot force someone to start injuring others.
I do know people who behave like this and I as well often quote video games, internet memes, and such. Though it's only around my closest friends and we'll cease when asked, as it can get very annoying quickly.
Though as far as video games effecting someone enough to make them physically harm another person, I believe they can. A person who goes out and harms another human intentionally is generally unsound (often times in more ways than one) and was just waiting for a catalyst to trigger them. Which a video game can very well be such a catalyst for such unsound individuals, though a video game itself cannot force someone to start injuring others.
I do know people who behave like this and I as well often quote video games, internet memes, and such. Though it's only around my closest friends and we'll cease when asked, as it can get very annoying quickly.