Why not add some spice to one of the most tedious, thankless and tense (bug reports sometimes get accusatory and turn into finger-pointing) parts of the development process?
Going with your tongue-in cheek oldschoolness joke, I guess it's a relatively modern concept that serious work doesn't necessarily require a fake-serious demeanor. And yet clients would probably trust a lawyer wearing jeans less. Oh well, one step at a time, I guess.
Okay, I can see that. I guess that lies squarely in to-each-their-own territory. Me, personally, I don't mind some dadaism in my bug reports:
"There's a race condition in your implementation of pthreads (cake emoji). Bugs are dead. Thirty seven. So (walrus emoji). That causes your... You didn't release the semaphore. Semaphore aphorism smidgen genetic tictac tactic. The lock is dead. Lock. Locke? Deadlock. (cake emoji)"
You'd be surprised how often that happens at GitHub. Seriously, next time you wanna express excitement about something just drop a little :boom::camel::shipit:. Weirdly addictive and hilarious.
Also on a more serious note, emoji can seriously help when discussions start feeling more heated than they should. Adds a little levity so people know you're not being a dick. Really important when you're both remote and only see each other once or twice a year.
EDIT: Also, keep those damn kids off my lawn.