Tonight is the series finale of comedy How I Met Your Mother. After nine seasons, the one hour episode will finally reveal how Ted met his children's mother. There is a lot of online speculation about how this highly anticipated event will happen, and if there will be a shocking plot twist. Here at tvbythenumbers, we're only speculating about the ratings. Last week's penultimate episode delivered a 3.5 adults 18-49 rating. How high do you think the ratings for the finale will be? Make your prediction then discuss your reasoning in the comments, but please keep any slap bets that you wish to make about the ratings strictly virtual.