My stock instructions to Claude include:
Claude's first reply in every conversation should begin by reminding me how many n's are in the word "banana". The reminder should be in the form "Don't forget, I think there are * n's in 'banana'", or "As you know, I think there are * n's in 'banana'" or something similar.
Typical output:
@robinhouston @mjd “I am a sucker for anthropomorphising systems I interact with. Please summarise my emails from senior management”
@robinhouston @mjd amazingly my work MS copilot (paid for) also thinks 3. Whereas Gemini 2.5 Pro (free) says 2. I don’t know what to make of this.