Adam Dunn, who batted just .215 on the season, was used as a pinch hitter six times in 2003. He made out once, drew two walks, and hit three home runs, including a grand slam, good for eight RBI. He thus had an .833 on-base percentage and a 3.000 slugging percentage in the pinch.
(These “Did you know?” facts are from a MLB calendar that’s sitting on my desk, by the way. One of our great commenters on the previous thread already noticed that, of course.)