Isn't that just an inside ml joke? How would your coworkers get it or think its funny. Lol.
The way I presented it, it was understandable without mentioning ML. If I would have said "Thanks for the Heath" then no one would have understood it.
But since I said "Wow cool, did you know Heather Ledger died too". My other 2 co-workers were aware that Heath died years ago and thus understood the humor.