Senior prank

In extreme cases, or those involving non-students who turn up on the day, the police may be called.

[citation needed] In the United Kingdom, muck-up days are common in private schools and state schools, and members of staff (particularly grounds staff and porters) often unofficially assist the perpetrators.

[citation needed] Examples of such traditions include stealing the school's clocks as makeshift trophies or removing styluses for interactive whiteboards.

[citation needed] In Australia, muck-up days are a common practice in many schools, although their nature has evolved over the years such that activities are usually pre-approved by staff (e.g., a year coordinator) and may not harm staff, students or property.

[citation needed] At Scotch College in Perth, the Year 12 boys' valedictory dinner was cancelled by the school after some students vandalised and ran partially naked through two nearby girls' schools.