Karl Shuker has a new article up on his blog about a very old Loch Ness Monster sighting, where the witness, a diver named Duncan Mcdonald, said he saw a "frog as big as a goat" beneath the lake's surface.
Shuker reprinted the original newspaper account on the sighting and the whole article is a good read. It and many others will also be discussed in his forthcoming book Here's Nessie! A Monstrous Compendium from Loch Ness.
See Shuker's article here.