1. A headcrab, also seen in Half-life.
2. A facehugger, also seen in Alien.
3. A small, furry creature that creeps into your bed in the early hours.
1. 4rgh, +3h cl1||gy|\/|0||5+3r just pw||3d meh!!111
2. Jonesy, dont look now- there is a clingymonster behind you. We're wasted, man.
3. Mhmm, that darn clingymonster ate my cheese again. I must buy some more, but, not in the early hours!