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Want a weapon far deadlier than just about anything the TSA would take away from you, short of a gun? Do this: Take any 5 cent recordable CD, and place it on its edge between the floor and your shoe. Slowly step on it, breaking the CD. The resulting shards of CD are sharper than most knives -- definitely sharp enough to be threatening.
I'd guess that most passengers who carry on a laptop are also carrying this potential weapon with them.