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Set up simple behavioral trigger words with certain people that lead to innocuous but regularized reactions. For example, if you are with someone like a colleague, every time they mention a particular topic, say “footfall”, find a way to work “milk” into the conversation.
If you are discussing your weekend plans in mundane office chat, always mention you weekend plans involved eating boxed cereal somehow.
You can even provide a gestural response. If a certain person is mentioned, then scratch your elbow in an obvious way. It should register in memory, but not be fully conscious. It is hurried over till the trigger topic is broached again, resulting in another scratched elbow.
See if they notice, or just allow the side channel gossip to swirl about your strange reflex.
This could even culminate where your colleague discovers the trigger, and tests a theory life, resulting in your sequential scratching of your elbow.