Challenge Accepted

In the aftermath of Ted and Zoey's break-up, Ted is having second thoughts. He is freaking out about an issue with the GNB headquarters, and historically when Ted freaks out about something, he turns to dating an old girlfriend if only for something comfortable and familiar, however bad returning to that relationship ended up being. When Barney and Robin find out that Ted is going to meet Zoey to get back together with her, they have to try and figure out where that meeting place is so that they can stop him. Beyond piecing together this puzzle, Barney and Robin's quest leads to them discussing their own relationship. Meanwhile, Lily has come down with a case of food poisoning from some soup. Marshall eats the soup three hours later, which means that his symptoms of excessive vomiting will start three hours later than Lily's did. Marshall has a job interview with a major environmental law firm in a few hours, and he is just hoping that he can make it through the interview without vomiting. Ted and Barney argue about which of them will have the pleasure of pushing the button when the Arcadian gets imploded. And one of these situation is the starting point for an imminent trip to the altar.