I was reading an article in a newsletter that contained the following sentence: “People in many countries are bulking at having their children vaccinated.” I had never seen this substitution of “bulking” for “balking” before and I wonder if I have discovered a new mondegreen or if this was just a typo.
The formal name of a mondegreen is an unwitting paronomasia. This video gives you a better sense of the phenomena:
peakmemory 
I vote for typo!!