You've probably encountered a friend from another town who doesn't say things the way you do. It's not that they use strange words or pronounce things very differently from yours, but something about them sounds different. One of the possible reasons why your neighbor speaks differently could be the air conditioning. This phenomenon consists of pronouncing words like 'profit', 'rabbit', 'fucked' as 'prufito', 'knife' and 'harvested'. That is, to make the 'o' followed by 'i' be pronounced as a 'u'. Thus, speakers who do this pronounce 'mulino', 'cusí', 'bucí', 'prufito' and even, 'communion', 'cumu' and 'turtle', unlike those who pronounce everything with an 'o'.