Ontology is one of the three central branches of metaphysics, dealing with the nature of reality. Guerilla ontology is any ruthless (guerilla-like) tactics to shake people into questioning their assumptions about reality. Situationism definitely falls into this category.

A short reading-list for the interested:

• Leary's Politics of Ecstasy and Info-Psychology (later re-released as Exo-Psychology).
• Prometheus Rising and Cosmic Trigger by Robert Anton Wilson.
• Upwingers by F.M. Efsandiary.
• Temporary Autonomous Zone by Hakim Bey.
• The Invisible Landscape by Dennis and Terrence McKenna.
• Programming and Metaprogramming in the Human Biocomputer by John C. Lilly.
• Altered States by Paddy Chayefsky.
• Ulysses and Finnegans Wake by James Joyce.
• Beelzebub's Tales to his Grandson by G.I. Gurdjief
• Just anything by Aleister Crowley, Thomas Pynchon or Philip K. Dick.