Cracking almonds without a nutcracker?
To summarize the comments:


Use common household tools (such as pliers) as improvised nutcrackers
Try using the bottle gripper/opener on kitchen shears as an improvised nutcracker
Use impact tools, such as a hammer, a heavy pan, or even cleaned rocks as nut smashers, but you may not get whole nutmeats with this method
Bite the bullet and buy or borrow a nutcracker


(This is part of my little quest to get answers to some of the non-answered questions....)