The biggest problem with this is that it's too obvious, if you really want to fuck with people it should require more effort for them to tell what's wrong.
An insidious little niggle that grates upon the mind.
An insidious little niggle that grates upon the mind.
handle becomes handel
Or strip out past tense:
fined becomes fine
Also: You're always spelled as your; Oxford commas never; Two becomes too Public becomes pubic
I'm not sure of the extent to which you could use ligatures to tweak the serifs, rather than remove them completely (if possible - frustration will be maximised if the reader is unable to tell what's wrong, even after they come to believe that something is wrong).