As R’ Yoel was about to begin his shiur, a bochur walked in unexpectedly with a small birthday cake. R’ Yoel seemed bemused and somewhat surprised.
Due to the high level of respect for R’ Yoel, the normally stoic atmosphere was broken by the bochrim present chuckling at the gesture.
As for R’ Yoel, he simply proceeded with giving the shiur without making any mention of his birthday.
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