I blogged about this first a long time ago – people invent the phrase they think they heard, and their version has elements of ‘truth’ which are interesting:
‘without further adieu’ instead of ‘without further ado’
‘it isn’t a job for the feint hearted’ instead of ‘it isn’t a job for the faint hearted’
‘arranged eroticly’ instead of ‘arranged erratically’
‘top-draw collection’ instead of ‘top-drawer collection’
‘evil.com mascaraed as bank.com’ instead of ‘evil.com masquerading as bank.com’
‘to achieve the up-most pinnacle’ instead of ‘to achieve the utmost pinnacle’
http://eggcorns.lascribe.net/