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!"
>

doc/fixes34.1

@@ -213,3 +213,4 @@ debug mode: #panic routine to test panic() and panic save file generation
 a new PANICLOG optional file to log the reason for panic and impossible messages
 added validate_prefix_locations() for early directory prefix validation
 fire traps are particularly bad for paper and straw golems
+cream pies can be 'a'pplied to cause direct temporary blindness