a few we had at work were shiner bock and its derivatives (winter brew, etc), bud and bud light, miller and miller lite, coors and coors light. that is by *no means* an exhaustive list. another way...
Most mass-market beers, like those made by Anheuser-Busch, Coors, and Miller have twist-off caps you can open with your hands, but craft brews tend to have pry-offs that require a bottle opener....
Because we're lazy, and we want our beer now, we dont' want to have to search for a bottle opener. Americans are constantly searching for the easiest, quickest way to do everything.