Reference: al-Jaami’ li-Hayaat al-‘Allaamah Muhammed ibn Saalih al-Uthaymeen – Page 42
It has been narrated:
The Shaykh once rode in an old car of a dear friend which happened to break down a lot. So, along the journey, the car broke down and the Shaykh said to the driver:
“Stay where you are, I will get out and push the car”
So the Shaykh got out and pushed the car himself until it started up again.
Such was the extent of the humility of the Shaykh (rahima-hullaah).