My mother is from London and she always used to say 'maswell,' as in 'yeah, we maswell do that.' I never really thought about it until it came to my GCSE English Lit exam and I could not figure out how to spell it. She said it again a few days later and I questioned her over it. Turns out 'maswell' is actually her version of may as well. I have no idea why I didn't work it out earlier.
A childhood belief about speaking

others believed things like this
- i used to believe that if i didn't work at school, i would have donkey ears, so now i work hard !!!— denis
- I used to think that even people who spoke something other than English, thought in English— Peaches
- I thought Jedi fought with Life Savers... I never questioned it either! Anon
- up until about 6 years ago i thought everton was in london!Anon
- When i was little i thought casualty was a big hospital in londonAnon
- When I was little I thought the london underground was a terrorist organisationAnon