Awesome moment for me last night in Watch Dogs. I was completing the criminal convoy side missions, which are basic and consist of cutting a small convoy off before they reach their destination. Anyway, the very last mission is called, "Requiescat In Pace", which is Italian for rest in peace. The significance is Ubisoft's link to Assassin's Creed, as those would always be Ezio's last words to one of his main Templar targets.
Anyway, you start the mission by hacking the phone of Olivier Garneau, who is being escorted to the Sears Tower in Chicago. After hacking in and discovering the convy route, Aiden comments on how the guy is into some serious stuff with Abstergo, genenetic memory reconstruction, etc. So you track him down, run him off the road, and take out Garneau and his body guards.
It's nothing actully related to the Watch Dogs main storyline, but I love how they teased Watch Dogs in AC4 with Olivier leaving for Chicago and you being able to discover files on ctOS, and then carrying all of that from AC4 into Watch Dogs.