Be warned, How I Met Your Mother fans: You may want to have some Kleenex nearby for Monday's episode. "I think it's fair to say that the episode is different than anyone had imagined coming into it," co-creator/co-executive producer Craig Thomas tells TVGuide.com. "It's one of those where while we're shooting it and editing it that you see people tearing up. It's very funny, but it's very emotional too. The very end of the episode seems like it's made a lot of people cry, but it's a good cry." The episode picks up moments after Robin (Cobie Smulders) told Barney (Neil Patrick Harris) that she's pregnant and it is chock-full of more surprises, Thomas says —including, as the logline teases, some "bad news" for Robin. What could that be? Read on to see Thomas' hints about this revelation, why he and Carter Bays wrote the pregnancy, and what's next for the rest of the season.