Flying from Dallas to Vegas I inadvertently left a small gimee multitool in my carry-on bag that I only realize is there on arrival.
I promptly forget about it until I'm in security on the outward leg of the trip and the x-ray screener in Vegas takes a second look at my bag and I suddenly remember again. I'm asked to step aside and tell the inspector I know exactly what the problem is and once they find it advise them to keep it in spite of assurances from the inspector that I can step outside the secure area and mail it to myself. I don't even need to look back at the line I worked my way through to tell them that it means nothing to me and to keep it. I then proceed to wait an hour for my flight without incident...
Interesting story, the TSA are pretty bad about catching things they should have. I had a similar experience to djspump2003. I'm a procrastinator, so when I PCS'd from Korea to stateside I procrastinated about scheduling a pack date for the guys to pack my barracks room. Two days before I fly out I have the contractors come and pack everything, and everything that didn't get packed went into my personal ruck or duffel.
So I went through two screenings, one in Inchon, and one in Seatle (TSA rescreens every flight from overseas transfering into a domestic. Low and behold when I unpack my ruck I find small arms parts (M16/M249/M9) and a few blank rounds in my pack. I practicly shat a brick and thanked my lucky stars that they where so incompitent.
BTW I was a unit armorer, and the reason I had small arms parts in my ruck is stuff (springs and pins, etc...) break all the time in the feild.