What's the most useless thing you can do

The most useless thing I can do…. I could argue with a fence post until the sun goes down if it’s wrong about something. Literally talk that fence post into changing its mind for no other reason than to make me shut up.

It’s taken me years to figure out that if there’s one person arguing with an idiot, even if one of them is intelligent, there are then just TWO idiots arguing… I guess you really can learn things in a chat room.
 
Going to a store which is well known for having exorbitant products and pretend I didn’t like anything there
 
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