Game Grumps got me into Yoshi's Island. I saw one of their many gameplay, and it looked fun. I saw they had the game on DS in the used games section at my local Game Stop. So I bought it for $5. It's enjoyable.
Some games I will NOT buy because of Game Grumps. One is "Sonic and the Black Knight". Arin, the Grump of the duo, went into one of the best GG rage moments ever. Unavoidable Chin Move, indeed.
Then I saw Jacksepticeye play Team Sonic Racing. I bought it when it was on sale. It's a little more frustrating compared to how much fun Sean had. (Yeah, quit that one for a while)
And Cuphead is a big, fat "good grief". Markiplier and the Grumps were not raging for views. The game is legit hard.