Jemand hat die Wände der Telefonzelle bekritzelt.

Someone has scribbled on the walls of the phone booth.

Die Kinder haben die ganze Wand mit Buntstiften bekritzelt.

The children scribbled all over the wall with crayons.

Er bekritzelt oft seinen Block, wenn er telefoniert.

He often scribbles on his notepad when he is on the phone.