Riddle

[hobbithole32]

A pill that no-one can swallow

[bibblebub]

bitter ?

[TheWinner]

I was going to say that too.

[DTCwordfan]

probably Bitter - but pedantically I do swallow my bitter and don't spray it through my teeth around the pub. It is not Norfolk down here....

[factor-fiction]

Is it something to do with post boxes/pillar boxes?

[weecalf]

pillOW

[nightmare]

If "pillow" is the correct answer, shouldn't the question have been
"A word beginning with the letters "p i l l", that no-one can swallow" ?
Yet another one of those feeble "not really a riddle at all" type questions.

Pillock leaps to mind for whoever considers it to be any sort of real riddle.

[factor-fiction]

'Pill' is a term for an American baseball ball- it could be that.

[sleepycat]

pill ar?

[NazNomad]

It's what has become commonly known as a drchris-ism. ;-)