I started a new hobby last year making pen and pencil sets using a mini lathe. I made a set for a friend of mine and she gave them to her grandson for graduation. Now he's taking flying lessons. The other day he went up in the air flying and had the pen and pencil set in his flight bag. Apparently, the ink cartridge exploded leaving one heck of a mess. I know we have several pilots on the forum so I'm wondering if anyone has heard of this happening before.