Don't laugh!  I have several sites I log into, some more often than others, and when you forget a password you are asked a security question.  I tried to login to Threads and could not remember my password, so I was presented with my security question [what is the name of your pet].  Well, unfortunately, I have multiple pets and could not pick the right name [and did not know if it was case sensitive] so had to create a new account with a security question that there is only one answer to.  Sigh.  Because my other email has an account "attached" to it, I cannot change the new account email address. 

Maybe, like many other sites, Threads could just send a new password  with a link to the account that lets you reset the password and security question.  Moral of the story - do not pick a pet's name as the security question, unless it is your very first pet!