Some dude at the bus station wants to know what bitcoin is.
you don't have much time and he won't be able to take in to much information.
a simple look it up online won't do, because that's not interesting enough to read a lot of boring stuff online.
What are 2-3 short(!) key features of bitcoin, which i could tell him, so that he has a basic understanding what it is? And of course so he will be interested to learn more about it.
Just short answer the key features of bitcoin, you can manage your money without another parties intervention in it, try that and you will get another bonus features for this.
We don't making a long explanation for them just telling about simple word can make them suspicious about it.