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In a coupled system of one classical and one quantum mechanical degree offreedom, the quantum degree of freedom can facilitate the escape of the wholesystem. Such unusual escape characteristics have been theoretically predictedas "M\"unchhausen effect". We implement such a system by shunting one of thetwo junctions of a dc-SQUID with an additional capacitance. In our experiments,we detect a crossover between quantum and classical escape processes related tothe direction of escape. We find that, under varying external magnetic flux,macroscopic quantum tunneling periodically alternates with thermally activatedescape, a hallmark of the "M\"unchhausen effect".

Flux Dependent Crossover Between Quantum and Classical Behavior in a dc-SQUID