what about yikyak (may god rest it's soul) and nextdoor type services?
could you gather a big enough coalition of fellow tenants to discover and document the existence of a gorilla within your living space?
how long would it take to accept a null hypothesis with multiple eyes wondering about it?
if there's never a long enough time to disprove the possibility of a gorilla... are you a bad enough dude to get everybody's attention for this... and pull the fire alarm?