Fear

Fear is a status effect that, much like horny, has different levels. Each level is an incremental debuff of your senses, cool, and reflexes. Getting struck by fear also has the possibility of making you immediately lose control of your bladder, causing you to soil yourself.

Different creatures, and some players, can cause fear. Being in the same tile as a Shoggoth gives you fear and looking at Great Old Ones also gives you fear, to name a few. Players who have the hideous freak mutation can 'scare' players and NPCs, a successful roll giving every NPC in the same tile a dose of fear. Psychotropic grenades are also capable of causing fear.

When drunk, players are immune to getting fear, although it is imperative that you get drunk prior to getting dosed with fear, otherwise you'll just be scared AND drunk.