Prank question

Hi all

I (21M) work with a colleague (50M). For context we are both electricians and do welding on the side and share a welder set up.

I just wanted to ask what would happen if i put tig fillet wire into a tig torch instead of a tungsten as i want to prank him but dont want to cause injury so thought i would ask if it was dangerous to do that or not before i did it 😅