As if it wasn’t embarrassing enough that John Roberts flubbed the presidential oath during the inauguration of Barack Obama on Tuesday, now comes word that Yo-Yo Ma and Itzhak Perlman lip-synced mimed their performance. Apparently, it was too cold for their Stradivarius instruments to stay in tune, so they were forced to employ a backing track to avoid sounding like Poindexter in Revenge of the Nerds. Well, at least they didn’t blame it on acid reflux! [TMZ]