Apparently this thing is called a camel cricket (or spider cricket)
"Camel crickets are of the most common household pest crickets they are. Many call this the spider cricket due to its close resemblance to spiders. Mainly they invade dark damp places such as crawl spaces, basements, sheds, and storage rooms and can lead to severe infestations. Camel crickets are often found hanging upside down on wood areas under houses. By the most part they are harmless but if not controlled they can get out of hand and sometimes the babies begin forging inside causing nuisance problems."
and it leaps.
HANGS UPSIDE DOWN AND LEAPS!
I just braved the basement and it's nowhere to be found.
Did I mention the fucker LEAPS?
AAAAAAAAAAAAAAAAAAAA!