high jinks
From Longman Dictionary of Contemporary Englishhigh jinksˈhigh jinks (also hijinks American English) /ˈhaɪdʒɪŋks/ noun [plural] old-fashioned LOUD/NOISYEXCITEDnoisy or excited behaviour when people are having fun youthful high jinksExamples from the Corpushigh jinks• The main features marking the presence of a poltergeist are moving objects, electrical high jinks, or mysterious noises.• He used to get up to all kinds of high jinks on those trips, by all accounts.• While the incident curbed her wilder high jinks, Diana was always game for a dare.