If you were to design a creature

The sewer creature reminds me of the blob, but looks a lot better. Creature design is hard, and that's why you see either see variations of man in a suit or some kind of dissected slime tentacle vomit with teeth. Good question nonetheless, I need to do some sketches.

The scariest,most dreadful,hair-raising,terrifying,horrible,gruesome,dire creation that I can think of is my ex mother-in-law !

ha! ^what sundar said, that's just classic!

My Missus when I come home late and drunk is the scariest thing ever. I can't post a picture of her when she's angry as your faces will melt!

@Paul426, that's the only way I'll go home; late and drunk.

I like your thinking Sundar. From now on I will be always late and drunk...even for work!

That is horrifying.. It's real you say?? OMG.... I found a link, it IS real OMG it's some kind of worm colony. :( Link-->[url=http://youtu.be/_g3IH8qDSzk]Gross worms[/url]

http://www.youtube.com/watch?v=ZBWNqEqtgK4&feature=g-u-u Anything crossed with a crab, they're creepy as fuck.

Well since we're talking about something related to Giger here I may as well decide on [url=http://youtu.be/wfu16P5dQo8]this one[/url]. Otherwise, I'm preferential to a slasher-type Necromorph. There's just something so satisfying about this freak of nature with giant blades that just comes sprinting at you at blinding speeds while screaming, then when it comes toward you it rips you apart.....though the Twitcher's creepy in its own right, too. Now I can't decide...

...anything wormish just freaks me out....i once threw some chicken bones in my trash can and went away for the weekend...i came back and their was magots crawling all over the floor.....i nearly went insane!

I'd have to say a giant biomechanical spider, it's face is basically a big version of the facehugger's with blunt fangs either side to crush the brain and permanently prevent victims' attempts to escape. It has an octopus/xenomorph tail which stabs into people and paralyses them before it rips all of it's victim's limbs off their body before eating their flesh as it can't process the bones, it then turns it's victim's rib cages into materials for xeno eggs. :)

@[b]ElephantMan[/b] Spiders are always scary. But one like you described is a nightmare-come-true. Maybe the Brazilian Wandering Spider would have nothing on it, eh? And those spiders are scary; they're unstable, irritable, and they hide in banana-bunches. A couple learned this lesson the hard way when buying bananas in Superior, Wisconsin. The lesson is, never buy bananas at Wal-Mart.....I mean, uh, never buy bagged bananas.