Oh i hope it doesn't happen to me then tehehehe i have a friend who has lived here most of her life but originally came from liverpool, she speaks rather lancastrian now but when she's in a mood or having a go, oh dear the birth accent comes straight out, least we know when to leave tehehe
My X husband was a southerner & moved up to lancs in his mid teens but he has a crossover of the 2 accents going at once so nobody from up here understood him nor did anyone down south tehehehe, so it can get very confusing.