It's usually a reply to acknowledge a particularly painful pun, isn't it?
Perhaps I'm misremembering.
(
The Porcupine From Purgatory katsu revival trust,
Fri 2 Oct 2020, 8:26,
archived)
Spang
I had to look twice at my posting
(
razzle,
Fri 2 Oct 2020, 12:48,
archived)