Then I took an arrow to da knee!

One of the most funny but overused video game quotes ever! Originating from the smash hit skyrim by Bethesda, there is a single guard that states "I used to be an adventurer like you, but then I took an arrow to the knee!". This guard cannot adventure any longer because in medieval times, the difficult techniques required to fix a shattered kneecap did not exist. This is assuming it was a barbed arrow shot my a medieval bow, which was common practice then, it would have had to be pushed all the way through his knee because those arrows were triangle shaped and could only go one way without permanently ruining his knee. So he could no longer adventure. There is a game theory video detailing it further.