I have some:
People say "jewl-u-ry" instead of jewelry, and when people say heighth instead of height. UGH!!
I also can't stand "nu-cu-lar" (nuclear) either, as someone else mentioned already.
Also, our last name is Colin, pronounced Koh-lin, not Collin. People always want to say our name with a short 'o' sound instead of a long 'o,' even though we pronounce it the correct way (it's Koh-lin because there's only one consonant before the vowel; it would be Collin if there were two L's!)