Not that i am complaining but i was wondering if i am the only one
It's really seldom to see this happening , it would be great if someone send you 25 btc for the mistake
Since you got from exchanger, I think there must be something not right on their system but if they did not care about it, you can enjoy that $ 3 ++
Agreed that there maybe something wrong happened from that to be sent by mistake.
By the way, OP was just lucky to receive such a amount, even it's low, since you can rarely see a mistake on being sent to the wrong address.
I have also received some small amounts in the past which probably were from some old faucet but unless you hack someone's system so every time they copy paste an address then your address gets replaced no way someone mistaken an unique address with another, that's the amount and or fees that people tend to mistaken and send the wrong amount but not wrong address.