Johan van Summeren winning Paris-Roubaix 2011.
Garmin already made a short docummentary about that you were able to watch on youtube but I can't find it there anymore. I wish I could just post it instead of writing everything down but there you go.
In summary: Johan was struggling with tendinitis that spring and it was unsure whether he would have been able to recover in time and start the race. Garmin was really packed with cobbled specialists that year- Hushovd, Haussler, Klier, Hammond, Vanmarcke, Maaskant, Farrar. They could potentially line-up a team that was 100% consisting of riders who had finished in the top5 in PR, RVV or GW before. Hushovd was probably 2nd biggest favourite of the race after Cancellara. He came 2nd the year before and 3rd two years earlier. He also wore the World Champion jersey which would have made his win even more special. It was his biggest dream and biggest goal to win PR one day. Garmin had pretty abysmal results earlier that spring for such a packed team. Despite having to many good riders in the team, Vaughters decided that Hushovd would have been the sole leader and the tactics was to try to have small group sprint for him on the velodrome.
With Van Summeren's form being very uncertain, the taks he was assigned for by Vaughters was just to go with any attack that formed after Arenberg and see what happens.
The race didn't start great for Garmin with Haussler and Hammond crashing out but there were indeed attacks after Arenberg and Van Summeren managed to find himself among the attackers. The group didn't look hugely threatening at first but with lack of co-operation in the main group, its chances looked better by every minute. Johan attacked on one of the last major sectors, leaving the rest of his breakaway companions behind. Meanwhile, behind him Cancellara tried some accelerations but wasn't really able to drop Hushovd, which put him in a difficult situation, because Thor was a better sprinter who didn't even have to work having a team mate in front. Cancellara didn't really have team mates with him. Hushovd did have Rasch and Vanmarcke but of course they wouldn't work too hard when they realised that Van Summeren had a shot at winning. It all played in Van Summeren's favour.
Eventually, Cancellara was finally able to drop Hushovd and was approaching Van Summeren quickly. As it turned out after the race, the Belgian rode the final few kilometers with a flat tyre! He was able to withstand the chase, nonetheless, taking the biggest win of his career and saving the spring for his team.
What makes it even more film-worthy was that Immediately after the race, Van Summeren proposed to his girlfriend, giving her the cobblestone trophy. She accepted IIRC.
One Garmin rider you could see was not ecstatic was Hushovd. He congratulated his team mate but you could see from his face that deep inside he was disappointed it was not him who won the race. He didn't know at the time, but it turned out that it was the last year during which he had the legs to be in contention for the win in Roubaix. That could add another dimension to the film.
Edit: LOL, I'm not even sure if his name is Vansummeren or Van Summeren. Both options appear quite frequently in search results.