Not exactly the worst fail I had, as it wasn't in regural gameplay, but I was fiddling in CLIVAN in wizmode, with stats upped to about 200 and physpher equipment, and decided to take on Petrus in fair fight, just to see how well would the more than triple stats than his and way better equipment would fare.
Petrus ended quardriplegic, and I, the living god, was decapitated by the archangel all of the sudden.