5. Lily and Marshall, from "How I Met Your Mother", are about to get married when Lily's high school boyfriend shows up. What is his name?
From Quiz Wedding Belles: Fictional Brides
Answer:
Scooter
Lily had no intention to and certainly did not invite Scooter. Lily's mum, who tries to avoid the blame by stating "I didn't invite that professional squash player Dad busted you with", was the culprit. To stir the pot Scooter is still in love with Lily and he's determined to win her back before she ties the knot with Marshall. It's safe to say that Scooter does not succeed even though he goes to the extreme of trying to win her heart by quoting lyrics by Guns 'n' Roses. Like all good TV weddings Lily's problems don't end there. She has no flowers for the ceremony, her veil has been ruined, her photographer is replaced by a telephone camera and her harp player has issues. Just as Lily (and Marshall) feels the wedding is falling apart Ted saves the day. He reminds Lily that she'd always dreamed of having a small wedding, to forget the reception (for now) and get married in the park. And so they do, with Ted and Robyn (as witnesses) and Barney (recently licensed to marry people) being the only others present. They then return to the reception without anyone else knowing that they were already wed.
(Additional trivia) Scooter, in this episode, was played by David Burtka who, at the time, was Neil Patrick Harris' (Barney) real-life boyfriend.