Decline a meeting with a vague "I'm not sure I'm available" and watch the meeting organizer squirm as they try to reschedule.
Example:
Use the microwave in the break room to "accidentally" reheat last week's leftover pizza, creating an explosive mess that forces the meeting to adjourn early.
Example:
Conveniently "forget" that the meeting is scheduled during a major music festival, forcing the attendees to either attend the meeting or the festival.
Example: