Be prepared to have no idea what's going on for the first hour. Title says it all.
Watched it today in Lockdown, had no idea what was going on, at all - but still had a blast.
When it's explained after the highway chase scene it's like a big ahhhhh. Then you start looking for bits in different timeliness. It's brilliant.
That said, I do how they don't spoil it with a sequel.