Here's a holy shit idea I have. Sort of.
(a) Imagine apple watch exists and is iterated on and is widely used etc.
(b) imagine apple watch has the ability to accept morse-code-like tap patterns from users without requiring them to unlock the screen first. So basically, I could do what Lando Calrissian did when he slyly sent a message to this bald friend to arrange a stormtrooper ambush.
(c) Okay, imagine apple watch is cognizant that I'm listening to podcasts, and what episode I'm listening to, and the current timestamp.
(d) imagine if I tap a certain pattern while a podcast is playing (e.g., triple-tap to denote this pattern is for the Podcast app, and then long-short-short taps to denote _this means drop a flag / timestamp / star / bookmark at current timestamp of current episode.