The "goto cleanup" idiom to do deferred work (I don't like defer or finally in languages which have them, but at least these are language constructs which say what we wanted, the goto cleanup idiom only achieves that in some very easy cases, in more complicated cases your actual intent will be unclear)

The "iterator escape" idiom to get out of some larger iterative operation we're doing because we just realised we want to give up / found the overall answer. This is lack of imagination in the language's / library's / eco-system's control flow semantics and is one reason I really like Rust's core::ops::ControlFlow.