How I Met Your Mother last night...

Did anyone else watch my favorite sitcom last night?  This season the show is enjoying a resurgence to the "good ole days" of the ensemble comedy but last night was completely unexpected.  I don't want to ruin it if you have not yet watched (this is one I watch in real time so very little delay for me) but I did want to discuss.  With that said spoiler alert ....

Most of the episodes this season have been very funny with the tongue-n-cheek wit that we have all come to love.  In fact "False Positive" that aired right before Christmas was excellent.  However last night was just hard to watch.  Lily and Marshall finally decided to see a fertility specialist, who turned out to be Barney's doppelganger.  This was the funny part and it was well done.  But at the end of the episode Marshall, who tells his Dad everything, finds out that he has lost his father.  I actually teared up, which never happens when I watch a sitcom (unless its the final episode).

My question is, how in the world will they make this funny going forward.  I am concerned that the next few weeks will be depressing and sad.  Any thoughts?  Still love the show just not sure where they can go with this without being overly dramatic.