This paper attempts to demonstrate how distinct semantic and pragmatic layers of modal interpretation can be fruitfully integrated within a constructionist approach. It discusses in detail a number of cases from the Simpsons where a modal verb, as part of a longer expression, has a short-circuited interpretation, that is, where it is conventionally associated with a context-specific modal semantic value and, in some cases, with added pragmatic information. Short-circuitedness is evidenced by the humorous effect that is obtained when a character wilfully or unknowingly ignores standard aspects of interpretation of such a modal verb construction.