To mirror everyone else here, don't anger those who can make your day a whole lot more difficult.
I was once returning from Hilton Head. Those of you who have flown there know it is a relatively small airport with only a few flights each day. I had traveled with a DSLR and some stuff (as we all do) and worked diligently to move dividers around in my backpack to hold what I was bringing on the trip. Actually, I re-arranged the pack several time until I was happy with the layout and had a great trip.
At the airport, the TSA agent did not like something they saw on the screen. The agent then proceeded to literally "tear apart" the bag, not just removing the expensive equipment, but ripping all the dividers out of their carefully Velcro'd positions. I politely offered to help and was met by a glare that only told me to not say another word. I just stood there with a "pleasant" expression on my face, knowing that I could be subjected to a lot more scrutiny at the whim of the agent.
At the end, I was handed the bin with all the equipment and dividers stuffed in, and had to put my whole pack and kit back together, again. No explanation was offered.
Ironically, I have had a much simpler and pleasant experience boarding a flight in Tel Aviv, and I suspect they know a thing or two about security at that airport.
