From the newsgroup, there was a discussion about how you

can't just blind yourself with a cream pie in your inventory
directly by applying it or by throwing it.

On 27 Jul 2002 14:11:06 GMT, <Someone> wrote:
> <email deleted> wrote:
>> <email deleted> (<Someone>) hypothesised:
>>
>> [cream pie]
>>> So I a)pply the pie. What I want to do is to hit MYSELF in the
>>> face with the pie, thereby blinding me and giving me T-P for
>>> just a few turns.
>>
>> Not a bad TTDTDTO ("Thing The DevTeam Didn't Think Of," which is
>> subtly different to a YANI, and not a bug; sorry, I seem to be
>> on a neologismathon today.)
> I tried throwing a cream pie upwards, hoping it would blind me,
> but no luck:
>
> "A cream pie hits the ceiling. What a mess!"
>

src/invent.c

@@ -871,6 +871,7 @@ register const char *let,*word;
 			be offered as a choice when already discovered */
 		     (otyp != POT_OIL || !otmp->dknown ||
 		      !objects[POT_OIL].oc_name_known))
+		|| (otmp->oclass == FOOD_CLASS && otyp != CREAM_PIE)
 		|| (otmp->oclass == GEM_CLASS && !is_graystone(otmp))))
 		|| (!strcmp(word, "invoke") &&
 		    (!otmp->oartifact && !objects[otyp].oc_unique &&