The "BEST" (or the worst) bag I ever opened was a white plastic bag. Inside I noticed something LARGE and BLACK.  That was not so bad but the Brown smears on the  inside the bag made me vomit, just a little but sit there was vomit.   

Best part really about this was that the unit was an office.  The person called about 10 times over the next two days asking for his personal belongings.  All I found that was personal was INNNNN guess where a white plastic bag.