Is this sarcasm? Or do you just mean bears that actually walk erect? Because bears most certainly naturally stand on their hind legs on occassion lol
This thread makes me want to watch Harry and the Henderson's...holy crap that came out the year I was born. Feeling old.
It never was a silly myth in the range of Loch Ness or Mothman, a ton of mountaineers and local residents reported seeing these creatures and still do. Just so happens that people mistake these bears for a "yeti", as I'd guess you don't have the best visual clarity up high in the mountains or when it's snowing.
The confusion is actually the direct result of poor pooty maintenance, as the hair confusion combined with the taste of salmon has led to many strange sightings and scientific conclusions.