So far my best campaign start was I told the group: Look, until I say so, everything you try works. No rolls. Your bad asses. Something will go wrong at some point, but it's imposable for you to die until this opening is over.
They proceed to pull off an amazing heist where they had to break in and tamper with some evidence. Just add they do their NPC teammates betray them, set off a chain reaction that kills a bunch of civilians, and leave them to take the blame. The law is on their trail, they are running out of friends, and finally they dive out of a high rise building and land in a trash heap. Then the campaign starts.