On his way to a speech to about 10,000 people at the University of Colorado, the president wiped his pants clean with a towel, made a quip about the Secret Service and said to the woman responsible for the spill: “Getting yogurt on the president, you’ve got a story to tell.”

The woman replied, “I’m very embarrassed.”

At the restaurant, called The Sink, one group of students was drinking Pabst Blue Ribbon beer and posed for a picture with the president.