# Bad Idea
You feel that eating the little dog was a bad idea.
Many things in NetHack are a Bad Idea, although that often only becomes apparent after your demise, which may well be YASD.
A few Bad Ideas include:

Using only the arrow keys.
Holding keys down.
Letting monsters hit you for no good reason.
Genociding @.
Blessed-genociding mind flayers as a dwarf.
Attempting to genocide while confused.
Casting force bolt in potion shops.
Casting fireball in bookstores.
Looting an exploding box in a tool shop.
Shopping while feeling jumpy.
Smashing open every locked door in your way.
Pasting into the NetHack terminal without checking the clipboard.
Quaffing from every fountain in the hope of a wish while at a low level.
Getting on your pony right at the start of the game.
Eating "just one more" giant or lump of royal jelly.
Eating rotten corpses.
Training strength by weight lifting.
Running around while brandishing a cockatrice corpse.
Levitating around while brandishing a cockatrice corpse.
Groping around while blind and bare-handed.
Leaving your wand of wishing in your main inventory, particularly before wishing for reflection.
Kicking the box in the Castle that contains the wand of wishing before removing the wand.
Putting all your wands or all your tools into your bag of holding.
Picking up nondescript gray stones.
Automatically picking up nondescript gray stones.
Retreating to a sanctuary to test your unidentified rings.
Letting an altar convert you.
Treating werecreatures very inhumanely.
Dipping for Excalibur before checking your experience level.
Engraving with the wrong object.
Teleporting the other Riders or their corpses.
Hanging out next to a drawbridge.
Looting bones files without pickup_burden.
Killing a nymph with a force bolt.
Throwing your metal daggers at a metallivore.
Throwing your enchanted daggers at a disenchanter.
Disconnecting from the server while you decide what to wish for.
Eating a tin while wielding your artifact weapon in a shop.
Editing wishes with the arrow keys in a terminal session. Your wish for an amulet of lifesaving may become a wish for a food ration.
Using a weak weapon to train skills for a weapon that you do not yet possess. It's best to use the best weapon you currently have access to; you can go up floors to train a weapon later when you acquire it.
See also
Lessons learned the hard way
YASD
DeathOnAStick

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