It wasn't just the worst game of the Colts season by both offensive and total DVOA. It contained the third worst game by a tight end in the last 12 years.
Dallas Clark two weeks removed from a concussion that kept him out of the previous game and flanked by Reggie Wayne, Craphonso Thorpe and Ben Utecht caught only 3 of 10 passes intended for him gaining only 15 yards.
eww.
Clark was very good the rest of the season putting up numbers that placed him as a solid #2 WR (FO listed him as a WR since he spent far more time in the slot than in-line), but that game was absolutely awful, especially by Clark (though he may not remember it or have known where he was at the time).