The climate could seem less than favorable, amidst shadows of recession, terror of overvaluation of shares and crises in the same discussion and trading platforms so far preferred by the new armies of small investors. But Wall Street has been the scene of a flashback of the phenomenon of so-called meme titles these days. Or rather, at least of a particular and particularly obscure case of unexplained movements and spirals of speculation, with increases measured by percentages of 30,000 …