Yes, olfactory. Similar to Trippin', "mine" (though I hate to have possession of it, lol) is rotten chicken. P-U. Doesn't happen a lot (TG!) and it seems very erratic, but it's always the same smell. Haven't been able to link it with anything cycling-wise (but there's not a lot of "data" to work with, and I'm a terrible record-keeper, so who knows?).

Is it one of your primary clues in recognizing an episode, xYesVirginiax?