Secret Wallet
The one place left on the human body for smuggling anything past TSA is in fact the rectum. As painful and disgusting as that may sound, you would be shocked to find out just how many people have attempted to do this. The discomfort someone must be in while standing in line and trying to make a normal face while walking around makes us wince at the thought.

Imagine going through all that and then being searched and caught red-handed, meaning all that effort was in vain. Not only would you look incredibly foolish, but some serious jail time could await you.