One funny story in Tomodachi Life is when my Mii character tried to sing a love song but got all the lyrics wrong. It was so hilarious as they made up their own words that didn't make any sense but still sang with great enthusiasm.
A very memorable story was when a group of Miis were doing a talent show. One Mii thought they could do a really cool dance move but ended up falling flat on their face. All the other Miis were trying hard not to laugh at first but then couldn't hold it in any longer. It was quite a sight to see and made for a great funny story. This shows how unpredictable the actions of the Miis can be in Tomodachi Life, which is part of what makes the game so entertaining.
There is no character named Vinny in 'Pulp Fiction'. The movie has a whole bunch of memorable characters like Jules Winnfield and Mia Wallace, but Vinny is not among them.
Sorry, without more context about the 'vinny scary story', I can't really tell it. It could be a story told by someone named Vinny or something related to a character named Vinny. Have you got any other hints?