sent a aviation oil sample in a while back. nothing forever, then i get a strange call from the USPS, left a message on the recorder at the house that made no sense at all.
then come home a week later and find a 3'x2'x2' box from the USPS on the deck with HAZMAT labels all over it. wife is on the HAZMAT team at work, and i am an engineer with HAZMAT experience. no explanitory letter or anything, just the box. after much discussion, and looking at it, we finally open the box.... and find inside my little blackstone tube mailer. no leaks, no nuthin, they just panic'd at the sight of "oil sample".
of course, by this time we had jerked the engine out of the plane.
DT