Dr Axel Stoll was a German geologist who later became widely known for esoteric and conspiratorial lectures that circulated as videos online. Clips of his talks, often about secret bases, Aldebaranians and hidden history, were shared ironically and turned his most characteristic phrases into running jokes. Wer weiss das became one of those catchphrases because it summed up his speculative style in three words. The isolated clip now travels on soundboards and in edited videos as shorthand for any claim that sounds confident but rests on no evidence at all.