I was having a conversation with a friend when he came up with an interesting idea, so I came here.
Could a Thug make a very successful career as a sword eater?
Say he makes custom, long but thin blades out of Pewter. As he swallows the sword, he actually flares and burns the sword as it enters his body, allowing him to stick ridiculously long swords down his throat. When the Thug pulls the sword up, the audience is astonished to see only the hilt remains.
I picked Pewter because it burns very quickly, but he would have to lower the sword down his throat slowly regardless, and because he might survive a slipup. A Mistborn would have a better chance with Duralumin, allowing them to burn the blade much quicker.
This is of course ridiculous, but would it work, even inefficiently?