What specific scenario exemplifies insufficient 'consideration' in an agreement where both parties genuinely intended to create legal relations?

A specific scenario exemplifying insufficient 'consideration' in an agreement where both parties genuinely intended to create legal relations occurs when a party promises to perform an act they are already legally obligated to do under an existing contract, in exchange for a new promise of additional payment from the other party. In contract law, 'consideration' is a fundamental element, referring to something of value (a benefit to the promisor or a detriment to the promisee) that is exchanged between the parties. It is the 'price' for a promise, signifying a bargained-for exchange. 'Intent to create legal relations' is a separate contractual element, meaning the parties genuinely intended their agreement to be legally binding and enforceable by a court, rather than a mere social arrangement o....