Celery, a comestible which uniquely has negative nutrition (because in real life, it takes a human body more calories to digest the celery than are in the celery.) The main use of this negative nutrition is to unsatiate yourself so you can continue eating other food.

It should be a large amount of negative nutrition in order to be worthwhile, but at the same time shouldn’t be instadeath for unsuspecting new players by immediately starving them. To that end, special case it so that it does not harm you if you are Hungry or worse, is worth -30 nutrition if “not hungry”, and is worth more negative nutrition if Satiated, possibly scaling up the more satiated you are.

Depending on implemenetation, it could either be safe or unsafe to eat when oversatiated - realism dictates it should be unsafe to eat, but gameplay dictates it would be useful in fewer situations unless it is always safe to eat. Or have it count as a small positive nutritional value assessed before maybe choking, followed by a large negative nutritional value assessed after you didn’t choke.

Knights still incur alignment penalties for eating celery while satiated.

The celery also crunches loudly whenever eating it, so it wakes up nearby sleeping monsters.

When a monster dies and leaves a corpse, they may make some noise that wakes up other monsters. The odds and radius of the sound increase with the size of the monster.

Pet cats lose 2 tameness when the player wakes them up. However, opening a tin wakes all nearby felines, and this will not cause cats to lose tameness when woken.

Eating too much food can give you a ‘hiccuping’ intrinsic, where you sporadically hiccup and wake up monsters. Drinking more than two potions of booze in quick succession can also do this. You can cure the intrinsic by drinking a fizzy potion.

Imps’ taunting wakes up monsters nearby.

If you enter the temple of a god who is angry at you, all monsters on the level become awakened and aggravated. This should print a more menacing message than the standard “forbidding feeling” one. (Note that a proper implementation of this requires that gods’ anger levels be tracked separately for each god.)

Attacking a queen bee immediately awakens and aggravates all killer bees on the level.

When a monster that you can see becomes awake, you get a message like “[monster] wakes up” or “[monster] is roused.”

If a monster steps on a squeaky board near you when you are asleep, it may wake you up. (Really, this should be the case for any effect capable of waking monsters.)

The rumbling from a rolling boulder trap wakes up monsters.

A floor trap that sounds a loud alarm, waking monsters (a lot more so than a squeaky board, perhaps level-wide).

New container trap effect, a loud alarm that wakes nearby monsters. (Exploding chests already wake nearby monsters, but the chance of it happening is miniscule unless your Luck is below -7; this was proposed as one of the common effects even at high Luck.)

Throne rooms generate their monsters awake, but also generate all their doorways as locked.

Eating a carrot is “crunchy”, and it may wake monsters around you due to being so loud.

Putting on a ring of protection from shape changers and forcing a shapechanged monster somewhere on the level to revert to its normal form wakes it up if it’s asleep.

Purple worms going “Burrrrp!” wake up nearby monsters.

Undead caught in a flash of light (from cameras or just from casting an area light spell) get awakened if they were asleep or confused (with a chance that decreases at higher levels) if already awake. Possibly, just illuminating their space by carrying some light source near them should be enough to wake them up.

You can stomp your foot by kicking at the ground. This causes noise around you, waking monsters, depending on how much weight you’re carrying. Cannot be done over a certain encumbrance.

If a monster is hurtled into another monster (i.e. from a monk’s staggering blow), both monsters wake up.

Throwing things against walls or dropping certain metal objects produces some noise and wakes monsters.

If you throw a bell (or possibly any non-cloth item), it makes a clanging or clattering noise that wakes monsters.

Several small spellbook additions:

• The thick spellbook weighs more than other kinds. The thin spellbook weighs less.
• Reading a dusty spellbook has a chance of making you sneeze (if you are in a breathing form with a nose), which wakes up monsters.
• Reading a silvery spellbook as a silver-hater makes you “not able to handle” the book and drop it