Reading the hound of the Baskervilles again and I find Watson's reasons to go to Baskerville Hall very funny
Because, his reason are 1) it might be a fun adventure, 2) Holmes said something nice about him, and 3) Sir Henry is very happy about it
So basically if you want to convince Watson to do something you need 2 things: something that could be dangerous but fun and handsome men being nice to him











