"Stop a Douchebag" - is a Russian youth movement that attempts to enforce the road traffic regulations in Russia. In this case they are stopping cars that are driving on pedestrian walkways.
Elephant's toothpaste is a foamy substance caused by the rapid decomposition of hydrogen peroxide using potassium iodide or yeast and warm water as a catalyst.
Kitchen drawer hits stove when opened.
The misunderstanding of a six year old.