For ten points, a fountain in Brussels known as Manneken Pis depicts a boy doing this.
Eusebius deepened the schism between Catholicism and Arianism by doing this with St. Nicholas' cloak. It's not jumping, but Cai Yuan and Jian Jun Xi did this on an art installation in London. The Emperor Caracalla was murdered by a disgruntled soldier while doing this in a street. Winston Churchill (*)  did this on the banks of the Rhine and the Siegfried Line after British troops secured them, and Jean-Jacques Rousseau wrote of doing this in a neighbor's cooking pot in his Confessions. For ten points, a fountain in Brussels known as Manneken Pis depicts a boy doing this.
Eusebius deepened the schism between Catholicism and Arianism by doing this with St. Nicholas' cloak.
Urinating  (accept  peeing )