Upcoming on Sunday is the eightieth anniversary of the first modern sighting of the Loch Ness monster, which occurred April 14, 1933 when a couple claimed to have seen what they described as an enormous animal in the loch. In honor of the occasion, yesterday at the Edinburgh International Science Festival in Scotland, Nessie scholars held a symposium debating the creature’s existence.

The photo above, shot by Robert Wilson on April 19, 1934, remains arguably the most famous Nessie image, and for years was touted as proof something large lived in the loch, until 1984 when the British Journal of Photography published an analysis by Stewart Campbell concluding that the object in the water measured three feet—not nearly long enough to be the famed Nessie. Years later, a big game hunter named Marmaduke Wetherell, who you see here, was fingered as the brain behind an elaborate hoax resulting in the photo. But true believers have disputed the account.

Subsequent sightings and photos have all been inconclusive, which means of course that nothing was decided at the Edinburgh symposium. Those who believe in the creature have no hard evidence to prove their position, and those who disbelieve can’t prove it doesn’t exist. The latter isn’t a surprise, as it’s logically impossible to prove anything doesn’t exist, whether monsters and deities, Kang and Kodos of Rigel IV, or the chair you're sitting on right now.

Doubtless those involved in the symposium knew that, which means the event was probably just a good excuse to shoot the shit for an afternoon then adjourn to the raucous Edinburgh bars. From there it’s just a few pints until someone drops his pants and screeches, “Watch out! The monster is out of the loch!” So be forewarned—the next Nessie photo you see will probably be someone’s pale cock, and if photo analysis proves it’s three feet long that’ll be one proud scientist.