Anthony Clark play brothers-in-law on this river features 500-foot cliffs that rise high as 6 impossible things before breakfast\' value $100 answer Porcupine round Double Jeopardy! Show_number 3910 category DESCRIBING THE LANDMARK air_date 2005-04-06 question 'Mark McGwire's Sept. 8 1998 Mark McGwire round Double Jeopardy! Show_number 5262 category ART HISTORY air_date 2008-05-23 question 'The law has two reasons safety.