Mori V'rabbi the Tolna Rebbe Shlita related that he was once in a car with the Rebbe and they observed a chossid in the next car beautifying himself in the mirror [chassidim DON'T look in mirrors]. The Beis Yisrael remarked "Baruch Hashem that Heimishe Yidden [good religious Jews] have enough money to buy their own cars."
The Tolna Rebbe thought to himself: "He is calling him a "Heimishe Yid"? If that fellow only knew that the holy Beis Yisrael is watching him" but didn't say a word.
Suddenly the Beis Yisrael turned to the Tolna Rebbe and said emphatically "But Hashem sees! What does it matter what I think? Hashem is watching....."