Eretz with a Gimmel

Currently reading Jokes: Philosphical Thoughts on Joking Matters by Ted Cohen. Here's an example

"Why should 'eretz' be spelled with a gimmel?"
"A gimmel? It isn't."
"Why shouldn't 'eretz' be spelled with a gimmel?"
"Why should 'eretz' be spelled with a gimmel?"
"That's what I'm asking you - Why should 'eretz' be spelled with a gimmel?"

Stanley Cavell has seen important philosophers transfixed by the exchange.

For those whose Hebrew is rusty (and/or non-existent) eretz means land e.g. Eretz Israel is the 'Land of Israel'. And gimmel is the name of the Hebrew symbol for the letter 'g'.