Maybe we didn't take this sinkhole on Lake Street seriously enough the first time around. Investigators scoping out the scene yesterday determined the cause of the 20-foot sinkhole: a 100-year-old brick sewer line.

According to investigators, the antiquated sewer line had probably been going to shit for at least a century. Once it started crumbling, the street started to sag and "the roadway just starts to give way," said SF Public Utilities Commission spokesman Tyrone Jue.

Last week, neighbors in the area noticed a dip in the roadway. In typical fashion, the city sent out crews to just patch over the top before inspecting the hidden threat lurking beneath. The sewer line collapsed, ripping open the street and now the street is closed until city crews can continue patching it up, "hopefully by Friday."

Previously: Sinkhole Threatens To Swallow Inner Richmond Street