Leadfinger said:
In Massachusetts, the city of Worcester is pronounced, "Wistaa."
The original and best (that's a lie, it's too far south) is pronounced 'wusster'. Supposedly it was great as an anti-German spy tactic since it appears in most kitchen cupboards outside Yorkshire.
Closer to home there's 'Slaithwaite', 'Dodworth', 'Cudworth', 'Barugh', 'Scunthorpe' and 'Clitheroe'. That last one isn't actually deceptive, but someone pointed out that it does say Clit Hero.
Scunthorpe is also not deceptive, and unfortunately it seems the amusement value of the game 'Find the rude word in Scunthorpe' is diminished when it's written down.