I have no idea how they got a dead crawfish to work out, but here you go:

Observe. from r/funny

From pumping weenies to doing crawfish-ups, this crustacean has it going on!

(How'd they do it? Well, if you notice when the crawfish is pumping weenies, you can't see the right side of the stick. The fingers, apparently, are just out of the shot. And as far as for doing crawfish ups: notice one of the tentacles is straight, as someone just out of the shot is pulling on said straight tentacle to get the crawfish to go up.)

Funny!

(Reddit//u/speikmonk8)