Mnemonic Effectiveness

Mnemonics should have one or more of the following characteristics to be the most effective.
This list is rather long. Just browsing through
the list should help when creating a difficult mnemonic.

a bit thick
mad
a bit thin
meaningless
abnormal
monstrous
amusing
moronic
anomalous
nonsensical
asinine
not deserving belief
balmy
not possible
barred
nuts
beyond belief
nutty
bizarre
odd
childish
oddball
closed-out
off
cockamamie
off the wall
comic
open to doubt
contrary to reason
open to suspicion
crazy
out
curious
out of proportion
daft
outlandish
disproportionate
outrageous
doubtable
outre
doubtful
oxymoronic
droll
paradoxical
dubious
passing belief
dubitable
passing strange
eccentric
peculiar
empty
Pickwickian
excluded
poppycockish
extravagant
potty
fantastic
preposterous
farcical
priceless
fatuitous
problematic
fatuous
prohibited
foolish
quaint
freaked out
queer
freaky
questionable
funny
quizzical
futile
rich
grotesque
ridiculous
hard of belief
risible
hard to believe
rubbishy
harebrained
ruled-out
high-flown
screaming
hilarious
self-contradictory
hollow
senseless
hopeless
silly
humorous
simple
idiotic
singular
idle
skimble-skamble
illogical
staggering belief
imbecile
strange
imbecilic
stupid
implausible
suspect
impossible
suspicious
inane
tall
incoherent
thick
incommensurable
thin
incommensurate
trashy
incompatible
twaddling
inconceivable
twaddly
incongruous
unbelievable
inconsequent
unconvincing
inconsistent
unearthly
inconsonant
ungodly
incredible
unimaginable
insane
unreasonable
irrational
unsound
irreconcilable
unthinkable
kooky
unworthy of belief
laughable
vain
logically impossible
wacky
loony
weird
ludicrous
whimsical
wild
witty
wondrous strange