escapade

seikkailu, hurjastelu

kepponen A daring or adventurous act; an undertaking which goes against convention.
1724, w:Daniel Defoe|Daniel Defoe (authorship disputed), "Capt. Howel Davis and His Crew" in w:A General History of the Pyrates|A General History of the Pyrates:

The Manner of living among the Portugueze here is, with the utmost Frugality and Temperance. . . . The best of them (excepting the Governor now and then) neither pay nor receive any Visits of Escapade or Recreation.

Nobody stood more confounded than Oldbuck at this sudden escapade of his nephew. "Is the devil in him," was his first exclamation, "to go to disturb the brute?"

He is always doing something to make himself notorious. There was that breach-of-promise case, and that fight at the political meeting, and his escapades at Monte Carlo.

He seems on the verge of winning the New York Senate election when the New York Post runs a photo of David’s exposed butt in a mooning escapade from his college days.