I was doing some office work this weekend and found this sign predominately displayed across the paper shredder:
Evidently one should not (right to left): clean the shredder (no problem!), put one's tie in the shredder (especially if connected to a neck), put one's hair in the shredder (especially if connected to a head), put your fingers in the shredder, or (and my favorite), place your baby in the shredder. Nice. I wonder how many lawsuits prompted these signs.