Father of Dragons

Depends on the fisherman

People really need to pay attention! Dontos rowed Sansa to a boat [in a foggy night] (so it cleared by morning, obviously). Dontos let Sansa go first, got shot, Littlefinger threw the necklace onto his body and left it in the boat. Obviously some fisherman found the boat with the body and took it to shore, probably reporting it to the guards.

I am afraid I must disappoint you. That was the unHorse from "Valar Morghulis"

I haven't even seen it yet (near to 18 hours to go) but just reading this is probably funnier than every "joke" in the episode!