It's Dangerous To Go Alone is a cool one page rpg framework about spontaneously handing out stuff you have.
Basically, you dig into your bag, pull something out, hand it over, and then that's the mythical object your player has to use to solve their adventuring problems with.
I wouldn't say Dangerous is an intro game, since part of its instructions are kind of just "play through an rpg" and it doesn't really go over what that entails. However, it potentially combos really well with other short rpg systems, and if the GM just brings a bag of random objects, it makes for a neat prompt generator too.
I'd recommend this to anyone who wants to freestyle a legend of zelda sort of game, or who wants to add some novel mechanics to their favorite system.