Described by Entertainment Weekly as "the hands-down best (talk show) guest in America," Chicago-born Bonnie Hunt began pursuing her acting career while working as a nurse at that city's Northwestern University Hospital. (Reportedly as late as the early 1990s, she returned to that profession for a month or so each year.) The smart, pixie-like writer-performer co-founded the Chicago improvisational troupe An Impulsive Thing before joining the famed Second City improv group, appearing in their productions "Bright Lights, Night Baseball," "Jean Paul Sartre and Ringo" and "How Green Were My