Words that are always pronounced wrong
Nuclear. It's not "nu-kyu-lar", it's "nu-klee-er"
Bagel ("bay-gull" or "bag-ull", I'm not sure which is correct)
Canada =/= Canadia
Llama ("Yama", apparently)
Pro[b]nun[/b]ciation, not pronounciation
Arab (AYR-ub, not ay-rab)
Ascertain (A-sur-ten VS Ass-er-tane. Not sure on this one)
Colonel (Kernel. But I don't think anyone gets this wrong)
Feel free to comment your own, I will add to the list.