Originally scheduled for 7:45 pm, the speech was delayed by about 15 minutes, when the President made an unannounced stop in neighboring Cedar Falls for a beer in a pub.

The president made an unannounced stop at the National Civil Rights Museum, next door to the Lorraine Motel, where the Rev. Dr. Martin Luther King Jr. was killed.

Off the pair went to Manhattan, making three unannounced stops at Eli's Manhattan, Citarella, and the Vinegar Factory - all high-end food emporiums.

The unannounced stop was made in Slave Lake, Alberta, where the royal couple toured the town that was partially destroyed by a wildfire in May.

Although such unannounced stops have been periodically in effect for the last five years, a stepped-up inspection program has been in effect since April, averaging two to three days of operation a week.

The reception at two brief, unannounced stops was not hostility but polite curiosity and some disbelief at the sight of the President, who had not set foot in the largest city of his realm for 42 months.

On September 28, 2010, the school was visited by President Barack Obama during an unannounced stop.

The fighting came as Secretary of State Condoleezza Rice arrived in the region, making an unannounced stop in Beirut, where she met Lebanon's prime minister, Fouad Siniora.

Ben Stiller and Paul Reubens (in character as Pee-wee Herman) made brief unannounced stops on the January 21 show.

A top Chinese official concluded a five-day visit to Israel on Tuesday with an unannounced stop at a state company that is outfitting Chinese aircraft with sophisticated surveillance radar.