One of the inherent risks associated with cohabiting.... ones cast iron pans may be used without ones knowledge.
In the case of the perfect 'Egg Pan', all it takes is one little toasted sandwich and it all goes to hell. Sticky sticky city, and never more an unbroken yolk.
The cure this time? A few runs with hard boiling water, and scrub outs in between. All the nasties float off the pan and get washed away, leaving it ready for a light oiling and a return to duty as 'Egg Master'.