It's the National Day in Belgium and Spirou (getting into the patriotic spirit) gets worried when he sees rain break out just as the King is about to pass by…
Behind the scenes
This one-pager was released in July of 1938 in Le Journal de Spirou #14 in Belgium. It was reprinted in the Spirou par Rob-Vel collection of all of Rob-Vel's Spirou comics. It has not known an official English printing to this day.