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Sen. Pat Roberts' unexpected ringtone

Sen. Pat Roberts, R-Kansas, gave a Senate Finance Committee hearing a little jolt Thursday, when his cellphone rang and started belting out Disney's "Frozen" theme song.

Agriculture Secretary Tom Vilsack was in the middle of testifying when -- just as he was concluding a minutes-long answer on food safety regulations -- "Let It Go" rang through the chamber.

Roberts scrambled for his phone before grumbling "Oooh, come on" into his microphone.

After a round of laughter from the audience at the hearing, the 78-year-old Republican responded, shrugging, "Just let it go."

"Sorry about that," Roberts said before trying to continue the hearing. "I know my time is up, I apologize to my colleagues."

Roberts later took to Twitter to explain away the ringtone: