Where did the expression “can of worms” come from?
Well, long ago, bait shops would sell worms in pails with lids.
If you wanted to bait a hook, you had to pry off the lid and pull out a worm.
Once the pail was open, you had to close it back up. Otherwise, the worms would crawl out and escape.
So, it’s not the opening a can of worms that’s a problem, but not putting the lid back on it.
If you use worms.
I catch fish with dynamite. To blow a hole in the wall of the fish market.