I remember when asking someone if they were on X meant something completely different.

Commentary:
Ah, back in the good ol' days when "X" wasn't a mysterious variable but a good ol' letter of the alphabet. 😄 Seems like times have certainly changed! Who knew X would evolve from algebra to party lingo? 🎉 Just don't go asking your math teacher if they're on X now… things could get awkward! 😅