Sunday night’s not usually the most bustling time at a coffeehouse – particularly on a St. Patrick’s Day when it seemed everyone was out drinking green beer and/or marking the end of an era – but Hotwire Online Coffeehouse (WSB sponsor) was crawling with people last night.

The occasion: A shoot for the in-production time-travel online series “Causality,” which just debuted this trailer at Emerald City Comicon downtown earlier this month:

They’ll be filming at another West Seattle location later today, we’re told.