WHO INVENTED THE FIRST GUN?

[Sunray]

The oldest existing European firearm dates from the 13th Century. The Chinese used bamboo tubes in the 10th Century. The oldest Chinese surviving firearm was made in 1288. However, firearms were a known thing around 1126 in China. No rifles until very, very much later.
"...the first guy to eat an Oyster..." Real question is how drunk was he that he thought eating an oyster was a good idea. Might have been a 'Red Neck' saying "Hey Bubba. Watch this!"
Have a repro of one of these. Isn't a 1" bore though. File:Gun Sweden Morko.jpg - Wikimedia Commons