Spread cream cheese, peanut or almond butter (make sure the butter isn't runny otherwise it won't hold) on two crackers so that it's thick enough to secure the pretzels.
Break 4 pretzel sticks in half.
Place the 8 broken pieces around one cracker to look like spider legs.
Take the second cracker and sandwich the pretzel sticks in between the two crackers, without them moving.
Dip two raisins in cream cheese or nut butters and stick them to the top of one side of the spider for eyes.
Serve immediately or within a few hours at the most.
Tip: Use more pretzels to create a sun instead of a spider.