I had two bottles of Scotch that I purchased at a duty free shop in Spain. Got all the way to Chicago where I was forced out of the "secure" area, just so I could be re-checked out by TSA who told me I couldn't take the Scotch with me. I ended up wrapping the bottles in an extra sweater and checking my carry on with the bottles inside it. The extra time made me miss my flight, but my carry on made it.

Another guy I was travelling with had a snow globe thrown away because TSA couldn't verify there was only 3oz. of water inside.