One Reddit user begins by pointing out that both beach Bernard and Teddy (here) are wearing similar clothes of a similar colour.
We start with the ninth episode of season one, where Bernard shot himself in the head by order of Robert (the great Anthony Hopkins).
One theory that has gained traction over the past week Bernard = Teddy (or B = T), something that sounds utterly rubbish but actually makes a fair amount of sense (sense in the context of weird Westworld theories, at least).
One theory suggests there are multiple host Bernards, backed up by a spoilery screenshot from one of the season two trailers.