@zwol M4 always was horrible, and I say that as the original author of GNU M4.
The original Unix M4 was weird, and there weren't really any good explanations for why it was the way it was. Apparently someone at Bell labs needed a preprocessor and wrote M4, sometimes in the '70, for no other greater purpose than to scratch a personally itch.
GNU M4 only exists because RMS wanted GNU to have what Unix had, and while I wanted to do something different and better, RMS convinced me to do M4 first.
Why do people clear their throats to attract people's attention?
I just had to clear mine, and the entire tram turned and looked at me expectantly.
I had to give a speech on supermarket apples and how they affect biodiversity in the southern kantons of Switzerland, to avoid any awkwardness.
There’s one sentence you can always use to shut down your internal monologue when it has you firmly in the grasps of imposter syndrome:
“Rudy Giuliani gave multiple talks on cybersecurity.”
René Seindal (MOVED)
Jonathan Smith
Grimm 
Another Angry Woman
Amy
nixCraft 🐧
Mike Sheward
Church of Jeff
Jon Baker
kira :3