Fewer secrets

In the past, if one wanted to say something to one's spouse, one could merely obfuscate a little and the boys would be none the wiser.
For example, one could say "remember the firstborn is going to the doctor tomorrow" and Mathias wouldn't know we were talking about him and HIS doctors appointment.
One could ask "do you think we should go for I-C-E C-R-E-A-M after dinner" without spoiling the surprise for little listeners.
Now Mathias' ears perk up whenever he hears anyone spelling something. Both because it is the challenge of finding out what it means and perhaps knowing that if words are being spelled it must be something interesting. And he knows he's the firstborn.... We need more obscure words.