But a day of snowmobiling in western Newfoundland, Canada became an impromptu rescue mission after the group stumbled across a moose buried in some 6ft of snow.
When I first drive the I-Pace, it's 70% charged, but since I end up launching an impromptu rescue mission for a stranded friend in stop-and-go traffic, it's down to 40% within a few hours.
Nasa clearly gets it, kicking off its press conference on the Voyager space mission with an impromptu skit based on the iconic opening sequence of Star Trek.
And while the magazine may be the first to hold a conference at which a former Secretary of Labor, Robert B. Reich, led an impromptu kazoo concert, it is not alone in its mission.
For Improv Everywhere's latest mission, they went to New York City's Central Park to give one unsuspecting couple an impromptu date.
For their latest mission, Improv Everywhere set out to Astoria, Queens to surprise some unsuspecting subway riders with an impromptu sleeper car.
Make an impromptu fondue.
He called for an impromptu national holiday.
The demonstration had an impromptu air.
Onstage, an impromptu party is forming.
