In the spirit of bump keys comes the padlock shiv. Using a small shard of metal extracted from an aluminum can, one can apparently pop most padlocks. I’ve heard about this before, but prior to this the only thing I’ve seen people manage to open with the shive was their flesh. These guys look to have gotten the process down successfully, but I wish the video had a better shot of the actual lock springing process.
How to open any padlock [Instructables]