Cat Gang
Riddle: Two cats are petrolling the woods when suddenly they both start to sniff the dirt. "Someone from trees gang has been here" says the first cat (who's name is Stringleg). "No.... someone from pond gang has been here" says cat number 2. Who is right and who is lying?
Answer: They are both right! Stringleg is a clever green eye-tabby from pond gang and her other cat is from trees gang, but they don't know that they are from different gangs. They can't sniff themselves so they don't know what the gangs that they are smell like... but they can sniff each other but they don't think they can sniff each other because they think they come from the same gang! So they both think the dirt is a different cat from another gang to the gang that they are.
Source: https://www.riddles.com/10424
