Musk's impromptu whipping of votes in opposition to the spending bill reportedly has House Speaker Mike Johnson considering a narrower resolution that would carve out much of the stopgap bill's appropriations.

Two military vehicles and several soldiers in full combat gear man an impromptu checkpoint – a foreign authority in a country celebrating its freedom.

When he was being steered on to the next part of the trip, he still dived across for an impromptu meeting with shoppers, shaking hands and facing the wall of mobile phones.

Last weekend, Hamish's primary school teacher arranged an impromptu concert in Tunbridge Wells and his mother showed the footage to her son.

He didn’t call, but a few months later, there was an impromptu third time.