Related for Megillah 48:12
אמר רב הונא זבלגן לא ישא את כפיו והא ההוא דהוה בשיבבותיה דרב הונא והוה פריס ידיה ההוא דש בעירו הוה תניא נמי הכי זבלגן לא ישא את כפיו ואם היה דש בעירו מותר
Huna said: A man whose eyes run should not lift up his hands. But was there not one in the neighborhood of R. Huna who used to spread forth his hands? The townspeople had become accustomed to him. It has also been taught: A man whose eyes run should not lift up his hands, but if the townspeople are accustomed to him, he is permitted.
Tosefta Megillah
One who leads the responsive recitation of the Shema, or blesses over fruit or over matzah, behold, he should not answer "amen" after himself. If he answered ["amen" after his own prayer], behold, this is how ignoramuses act. We do not answer with either an "orphaned amen" (i.e., where one does not know to what blessing he is saying "amen"), or a "truncated [amen]" (i.e., where one does not pronounce the entire word). Ben Azzai says, one who answers with an "orphaned amen" -- his children will be orphaned; with a "truncated [amen]," his days will be truncated. But whoever prolongs [his amen], his days and years will be prolonged.
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