A jape is a silly trick that you play on someone which is quite funny and which does not really involve upsetting them.
英英词典释义
Noun
1. a humorous anecdote or remark intended to provoke laughter;
"he told a very funny joke""he knows a million gags""thanks for the laugh""he laughed unpleasantly at hisown jest""even a schoolboy's jape is supposed to have some ascertainable point"