When I visited Loch Ness, they said it was most likely a large eel.

It seems those in Scotland also like telling tales to scare children away from dangerous lakes. The kelpies being a popular one.

https://en.wikipedia.org/wiki/Kelpie

That famous photo of a man's forearm sticking out of the water has keep the credulous going in circles for 100 years.

But don't look too carefully at that photo of Nessy or next you'll start to see the end-cap of an old Electro-Lux canister vacuum cleaner or a hubcap when looking at classic photos of flying saucers.