This story, according to the person I heard it from, happened some time in the 80s. It was about 10 years after Deligne's Hodge theory came out, but before Saito. It was not very clear how to define the mixed Hodge structure in non-constant cohomology. However, many people were convinced that such a thing existed (as turned out to be the case) and a number of competing proposals circulated. One such proposal was presented in a seminar talk where it was claimed that something was the "right Hodge filtration". At this moment Ofer Gabber (someone known, among other things, for giving hard time to speakers) intervened saying "What do you mean, the right Hodge filtration? What's the left Hodge filtration?"
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