Suggestion
When you drink a potion of potential -stat- but the potential is at its maximum, the game says "Completely tasteless."

I suggest the same message for the following occasions:
* Drinking a non-cursed potion of -stat-, if -stat- is at 99.
* Drinking an uncursed PoGA, if the randomly chosen attribute was at 99.
* Drinking a blessed PoGA, if all attributes were at 99. And if some weren't, only display the stat increasing message for those.

Similarly, when you drink a potion of wonder and it "increases" a spell that was at 30000 knowledge, it should say something like "You're reminded of your complete attunement to the '-foo-' spell."

Why it'd improve the game
See the first word of this issue's title :)

Notes
N/A