I haven’t seen This is Spinal Tap but I am a big fan of Harry Shearer’s Le Show, a weekly podcast. For the last few months, one segment has been about the misuse of so: People use it to start sentences that aren’t about consequences (“So we were standing there minding our own business. . . .”). I wrote Shearer to say he should change the name from Le Show to Le So. Not long after that, he ended the so segment with “here on Le So“.
That’s been an opening for jokes for years. “So a blogger, a podcaster, and a linguist walk into a bar…”