Some naive concepts:

The earth is flat.
The universe revolves around the earth.
The universe revolves around me.
The stars are holes in the firmament, letting through light from beyond.
Everything consists of four elements: earth, air, fire, and water.
Time flows like a river.
Our senses are trustworthy.
Our senses are not trustworthy.
The seat of emotions is the heart.
The seat of desire is the genitals.
The seat of intuition is the pants.
Structures and relationships are repeated at all scales, from the sub-atomic to the galactic.

Some compound words which include "punch":

rabbit
sucker
list
drunk
rum
line
card
up
ball
board
bowl
tape
paper
center
drift

Some more pairs of opposites, each with an identical number of letters:

force-allow
frozen-thawed
fixed-broke
prolong-shorten
lit-dim
temporary-permanent
clean-dirty
live-dead
mom-dad
rare-done
raise-lower
skinny-rotund
punish-reward
order-chaos
faith-proof
listen-ignore
above-below
rough-slick
cut-fat
home-away
gross-small
grand-plain
more-less
mean-nice
city-farm
her-him
daring-demure
menace-savior
failure-success
routine-unusual
sink-rise

Some pairs of opposites, each with an identical number of letters:

love-hate

black-white

old-new

violent-passive

play-work

mind-body

brain-heart

head-tail

stupid-bright

yellow-purple

right-wrong

jungle-desert

rich-poor

loud-soft

hard-soft

cool-warm

good-evil

plastic-natural

real-fake

glue-lube

strip-dress

help-hurt

cut-sew

build-wreck

bind-free

good-poor

sick-well

Some comic-book words that represent gunfire:

pow

crack

zing

plink

blam

bang

ratatatat

kapow

boom

kablam

takatakataka

bam

akakak

takow

Some compound words ending with -head:

hammer
flat
pin
dead
nail
pan
barrel
red
white
black
axe
bulk
beach
broad
hard
peg
spear
fountain
hogs
logger
bolt
maiden

Some things with a single opening:

bottles
cans
socks
shoes
bowls
thimbles
vases
cups
bags
boxes
tents
condoms
holes
pots
pans
buckets
drawers
caps
hats
ears
pits
ovens
glasses
jars
wells
lids
pockets
pouches
bins
boots
trunks

Some physical quantities, expressed in archaic units:

The radius of the observable universe ~ 2.838159 x 10²² leagues.
The diameter of an atom ~ 4.35 x 10^-9 spans.
The average distance between sun and earth ~ 760,000,000 furlongs.
The circumference of the earth ~ 8,095,757 rods.
The volume of the world's oceans ~ 5.29148 x 10¹⁸ hogsheads.
The volume of the Empire State Building ~ 37,000,000 amphorae.
The volume of the world's forests ~ 1.0733 x 10¹³ faggots.
The area of the world's polar ice caps ~ 8.5964-9.7177 x 10⁹ jugerum.
The mass of a uranium atom ~ 6.09 x 10^-20 grains.
The mass of the earth ~ 1.537 x 10²⁷ drachms (drams).
The mass of the sun ~ 6.06 x 10²⁹ talents.
The Planck mass ~ 0.00001399 pennyweight.
Atmospheric pressure at sea level ~ 416,745 scruples per square span.
Density of water at 4 degrees C. ~ 0.86 talents per amphora.
Acceleration due to gravity on earth ~ 22 cubits per second squared.

Some famous box-makers of the twentieth century:

David Smith
Donald Judd
Eva Hesse
Joseph Cornell
Tony Smith
Mies van der Rohe
Robert Morris
Anne Truitt
Larry Bell
Philip Johnson
Boise-Cascade
Andy Warhol
Jackie Winsor
Weyerhaeuser
Sol LeWitt
Marcel Duchamp
Jasper Johns
Frank Lloyd Wright

Some things that wiggle:

worms
spaghetti strands
fish
children
lines
eels
jello
rubber
ears
tentacles
toes

Some uncontained things that gradually disappear:

soap
ice
pencils
candles
suntans
polar ice caps

Some public actions that are inappropriate in private:

Making speeches
Cheering
Booing
Standing in line
Using a megaphone
Shaking hands
Debating
Acting self-important
Giving orders
Ballroom dancing
Playing to a crowd
Hooting
Hollering
Laughing hysterically
Drinking too much
Professional reserve
Self-consciousness
Heckling
Mocking those weaker than yourself
Pretense
Pompousness
Bowing
Curtseying
Saying one thing when you mean another
Wearing formal attire
Acting like a tourist
Cheating
Tipping
Padding your resume
Feigning interest
General fakery

Some objects meant to be disposed of after a single use:

toothpicks
facial tissues
toilet paper
tampons
sanitary napkins
bandages
surgical gloves
dental floss
coffee grounds
coffee filters
tea leaves
tea bags
cotton balls
cotton swabs
tongue depressors
hypodermic needles
scalpel blades
diapers
condoms
matches
straws
swizzle sticks
baby wipes
neck strips
nasal strips
dress shields