It happened 3 years back. I have a small tank outside my house, where I harvest some fish. I had to change it water pump thrice a day. Generally I change it every 8 hours. That day I forgot to change it. Before going to bed, I had realised I didn't switch the pump to the secondary one. I live in a two-storey house. My dad was, visiting me. While going downstairs, I saw my dad walking outside through the window. It was 12.30 in the morning. I was like, why is he walking so late. He generally walks before going to bed. I went outside to check on him, but no one was there. I came back to the room he was staying, and he was sleeping. Till this day I wonder what did I see that. Sadly after that incident my dad passed away after 2–3 months after that incident.