A bohemian circus mouse has had enough of the spotlight and the magician who conjures him up from the top hat every day. Using a nailfile he escapes his cage and embarks on a great journey.

2016 Ig Nobel prize winner György Kriska and his colleagues decide to prevent a massacre: applying their latest results in hardcore biophysics and a bit of tinkering they do their best to ensure the reproduction of the Danube mayflies, who are trapped and killed by the floodlit bridges over the river.