Using a Pick Axe to make a small cubby hole in the wall in stages with a lot of spawning enemies (Hint... Big Mommy Plant) can save your life if you need to heal/rest/eat.
Knives are more likely to hit a target when thrown.
If you destroy a snake's body, leaving the flesh only remaining, you won't get poisoned.
Food rots slower in colder areas (Glaciers, Plataues, Etc.)
Bones classify as blunt weapons.
Weapons with a lot negatives actually HEAL your opponent.
Armors made of cloth/hair actually reduce damage taken from stabs, by a small amount.
Armors made of metal absorb electricity, causing much more damage.
Kicking enemies into walls can cause the enemy to take more damage.
Kicking chests into walls can save time in breaking the lock.
A Pick Axe can be used to break down doors much quicker then kicking them in.
Digging increases your AStr.
Using the Pick Axe, you can make storage rooms which allow you to house equipment, and possibly food, for later selling.
Attacking enemies from behind increase your critical strike chance. IF you can tell where behind is.
Eatting a snake whole usually kills you. Don't bother. Same with spiders.
Being very precise with your wishes can yield very useful results.
Drinking from fountains usually cause more bad things, then good.
You can find rings and amulets.
Sometimes creatures can come out, being friendly.
You can release a spirit, that grants you a wish.
You may gain stat boosts.
You can gain certain magical effects.
Creatures can come out, and be hostile. A lot of them.
Brown Flat Slimes (Usually I die from these... -_-)
Snakes (SNAKES ON A FOUNTAIN.)
Dark Frogs (Varying in size.)
This accounts for the friendly, too.
The Spirit could be angry for being summoned.
The water can be contaminated by vomit, dead creatures, etc, causing stat drops, and even poisoning/disease.
You could get randomly teleported, which gets you soaked in water.
Being covered in water increases your resistance to acid, and can remove acid/blood/magic blood.
Magic Blood can cause your weapons/armor to degenerate into negative categories.
Wooden Shields, although just wood, have very high block rates.
Wielding two shields does NOT increase your chance to block.
Triangle Trade can be done in The World of Attnam to make a very nice profit.
Levitation does indeed help you greatly.
Levitation will let you avoid mines.
Thats all I can think of, for now... Pick Axes are useful, eh?