The term "color" refers to levity and insight provided by analyst. The most common format for a sports broadcast is to have an analyst/color commentator work alongside the main/play-by-play announcer. An example is "NBC Sunday Night Football" in the United States, which is called by color commentator Cris Collinsworth, a former American football receiver, and play-by-play commentator Al Michaels, a professional announcer. In the United Kingdom, however, there is a much less distinct division between play-by-play and color commentary, although two-man commentary teams usually feature an enthusiast with formal journalistic training but little or no competitive experience leading the commentary, and an expert former (or current) competitor following up with analysis or summary. There are however exceptions to this — most of the United Kingdom's leading cricket and snooker commentators are former professionals in their sports, while the former Formula One racing commentator Murray Walker had no formal journalistic training and only limited racing experience of his own (he had come from an advertising background and his initial hiring was more of a comic double act than a traditional sports commentary pairing). In the United States, Pat Summerall, a former professional kicker, spent most of his broadcasting career as a play-by-play announcer. Comedian Dennis Miller's short-lived run as part of the "Monday Night Football" booth in 2001 caused what Miller himself described as a "maelstrom" of perplexed reviews.