Alf became highly suspicious of Mrs Grumble in recent days.
She was behaving in a manner which seriously suggested she might have secretly become a member of the Green Party.
This would have been hugely shameful.
The suspicion was raised by Mrs Grumble suddenly serving tofu with every meal.
Tofu, so help us.
Tofu to a red-meat nosher is as offensive as serving pork chops would be to his good Jewish friends the Goldsteins.