There are societies where rather than knocking on wood one turns one's head and spits. For example: "Grandad is looking well after his fall, let's hope that doesn't happen again. Ptew!"

Looking for this in app form.

the true SaaS (Spit as a Service).

I'm imagining a thousand people in a spitshop in (Mechanical) Turkey in a sitting at desks with a spittoon, waiting for a signal to spit.