OK, that's a fun one - and there's even more things to blow up than the ones you mentioned 
Most notably the alkaline earth metals under Hydrogen (Lithium, Sodium, Ceseum and a couple others that I don't recall offhand), all of whom will spontaneously oxidize in air (and Ceseum is a liquid at room temp!), and a few of the high-end transuranics, which not only would likely go critical, but probably have never even existed in the quantities we're discussing here
Geoff - you had way too much time on your hands, and way too little sleep on the brain (but we knew that
Offsides
Drunkard's Walk Forum Moderator and Prereader At Large
Most notably the alkaline earth metals under Hydrogen (Lithium, Sodium, Ceseum and a couple others that I don't recall offhand), all of whom will spontaneously oxidize in air (and Ceseum is a liquid at room temp!), and a few of the high-end transuranics, which not only would likely go critical, but probably have never even existed in the quantities we're discussing here
Geoff - you had way too much time on your hands, and way too little sleep on the brain (but we knew that
Offsides
Drunkard's Walk Forum Moderator and Prereader At Large