You can't spell "action" without Keanu. Well, you can, but I would not.
BTW, did you know Hammer was up for Keanu's role in Speed after his appearance on The Real World? His auditions with Sandra left something to be desired and the rest is history, as they say.
I can't help but think the Lethal Weapon series would've benefitted by having Joe Pesci in the main role and Mel in a supporting role. Come on, Mel as an unbalanced alcoholic perpetually on the edge of violence and self-destruction just isn't believable.