Katsura disappeared from the sport thereafter, only making a brief impromptu appearance in 1976.

This week President Bashar al-Assad made what was said to be an impromptu appearance with his family on a huge city-centre square.

In December 2008, he made an impromptu appearance with David Smith and The Mojos.

Tom Wolfe also made an impromptu appearance while conducting research for his book "I am Charlotte Simmons."

A number of celebrities made impromptu appearances in the documentary as they were approached by the Abby Singer crew to attend their screenings.

"It's not that big of a deal," Nash said of the impromptu appearances.

In that impromptu appearance, Winehouse danced with Bromfield and encouraged the audience to buy her album, before leaving the stage.

Today, however, Gooden's fastball made an impromptu appearance on the mound.

Diplomats and officials have been worried that Mrs. Mandela might make an impromptu appearance.

Cafe Crown (1942) (made some impromptu appearances on stage, but was not officially part of cast)