[Haskell-cafe] FRP memory leaks

Hello, Cafe! I've heard that one of the problems of FRP (Functional Reactive Programming) is that it's easy to create memory leaks. However I cannot find any natural examples of such leaks. Could anybody post some (pseudo)code demonstrating this phenomenon? Preferably something that arises when one is writing bigger applications in FRP style. Thanks in advance! -- Łukasz Dąbek