Halp What words can you never spell correctly?

used to be necessary, wednesday, and february

now it's disengenous

not even sure if I got that wrong because I usually use chrome's spellcheck to fix it...and I often don't even get close enough for it to figure it out
 
Because of this retarded thing us humans possess called muscle memory and one of my internet usernames, I always screw up spelling "customer", as "cutsomer".

I have the same problem. I can usually spell just about anything (within reason) in my head, but typing it out occasionally gets fucked up by my fingers wanting to type "so then I stabbed the midget in the face" or something like that. I think they might be evil.

I also tend to leave out words when typing really fast, even though my brain processes them as part of the sentence.