As we were studying WWII, our history teacher told us a story that, to me at least, seemed apocryphal. But given that she didn't provide any citations, I was unable to confirm our falsify her story. So I'm turning to H.SE for help here.
Recounted, the story went something like this: A British man heard that some Luftwaffe were bragging about bombing London (this was amidst the siege of Britain made by Germany during WWII). This enraged the man so much that he rowed across the English channel, went to the bar in France which these Luftwaffe men frequented, shot 6 of the Luftwaffe men, and rowed back across the channel.
Any citation, Wikipedia article, or further reading so I can confirm this story and learn more are greatly appreciated. Blessings!