Don't force the shoes to fit.

It amazes me the amount of people willing to shove their foot into a smaller shoe just because they like the shoe or they are ashamed to admit their actual shoe size, or even worse, just because the shoe is on sale! I imagine that they must feel very uncomfortable walking around wearing a six and a half when they wear a size eight. The same goes for writing and character actions. If you make the characters do things that are out of character your readers will be uncomfortable.