By foreign accent I mean foreign to you, obviously, before anyone gets the arse about accents being foreign.
For example, I always say fillum instead of film because I just love that and it probably harks back to my boyfriend from Northern Ireland who I lived with for a few years. I also always say Norn Iron.
And I also always have to say Stonehenge as they say it in Spinal Tap, eg exaggerated mockney accent "Stunenngge". It does come up surprisingly often in conversation for me as I go up and down the A303 a fair amount.