Thirteen years after 9/11 and you’d be amazed what people still try to get onto planes

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HOUSTON, Tx. --  You'd think by now people would know. But day after day agents from the Transportation Safety Administration still confiscate the darndest things from airport checkpoints. And despite all the jokes and jabs taken at the TSA in films and media, people still try getting on the plane with their guns, knives and grenades in tow. So many, in fact, that TSA agents in Houston decided it was time for a refresher course.

Everything from guns to knives to faux grenades have been confiscated at Houston's airports in the last month alone. And as strange as it may seem to the traveling public, TSA agents say they're not surprised. "We see it all the time," Agent Jeff Hebert said at a press conference at Houston's Hobby Airport. "It's not shocking for us and the majority of the time people just forgot it was in their bag; they weren't aware of it."

The most commonly confiscated item: water. Liquids over 3.4 ounces are still not allowed through TSA checkpoints. The rest should be common sense. But if you're one of those who's not sure if you can bring your machette on the plane, click here for a complete list of prohibited items.