Because who doesn't want to be the dino responsible for taking out Dennis Nedry, this is the Dilophosaurus adult costume available from HalloweenCostumes ($60 for M, L, XL, $80 for a small for some reason). Obviously, it's also the perfect costume to-- "Make your spitting problem seem intentional?" *taken aback* Is it really that noticeable?!
Thanks to Joanna P, who agrees you just need a yellow raincoat, glasses and a Barbasol can to complete the perfect couples costume.