This paper examines the properties of double negation. Starting form the observation that despite the differences in the syntactic realisation of negation, languages such as Hungarian, French and English resort to the same strategies for marking double negation. Namely, a negative quantifier which contributes double negation systematically occurs with a fall-rise intonation, and triggers the implicature of contrastive, weak alternatives to the sentence. These properties are shown to correspond to that of contrastive topics. It is therefore argued that negative constituents which contribute a double negation reading are contrastive topics.