By skyforbes I'm talking about vibrating your tongue rapidly against the inside of your mouth to create that "motor" sound, also known as rolling your R's.
It's so weird. Your tongue literally becomes a rattlesnake tail. And even stranger is we can do it instinctively just by doing a super vague "push" thingy with our tongues and it sorta just happens- (EDIT: I was wrong it's actually blowing air that does it). If you've never seen your tongue when you do that I highly recommend looking in the mirror.
Also I understand it is crucial for various languages across the world, but I can't fathom a reason for WHY we can do it from an evolution standpoint.
edit2: I'm also learning not everyone is capable of doing it š sorry to those people