Acceptible excuses to give your wife regarding this.
"No honey, I've always had an interest in the spectacle of dance."
"Sweetie, you know I'm a huge Tom Bergeron fan."
"Erin who? Please, I heard Emmitt Smith was on."
"I just want to see more Bruno vs. Carrie Ann."
"...okay you caught me, but if you let me watch until she gets kicked off I swear we'll finally rent Sex & the City and I'll watch it with you."