Best way to kill a spider? DIE SPIDER. Die.

  DON‘T KILL THEM!  Spiders are good, they are like the law enforcement officers among the insect world!  They are not insects themselves, they maintain order there!
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Just put them outside.  They are just trying to make it through the day, like you.  The only difference is their world is very small.  

Disregard:  if the spider is a black widow or a brown recluse. 

STOP THAT!!!
Spiders are amazing little creatures that help rid our homes of pesky vermin such as flies which lay eggs in or food or upon our eyes and lips while slumber falls upon us.
They spur our imaginations and instill wonder within the eyes of a child's as they gaze upon the intricate webs the spider spins and weaves which listen in the morning sun. This post was edited by Jon at September 22, 2019 4:24 PM MDT

Spiders are kind of like cats - they are very self centered so the best way to kill them is by belittling them. Tell them things like centipedes have 100 legs you only have 8 or tell them a silk worm can produce 100 pounds of thread a day - you can't even produce a gram of thread a day. Eventually the spider will get depressed and hang its self. Cheers and happy last day of summer! This post was edited by Nanoose at September 22, 2019 4:25 PM MDT

Pay back.