«قُلْتُ ثَقَّلْتُ إِذْ أَتَيْتُ مِرَارًا، قَالَ ثَقَّلْتَ كَاهِلِي بِالْأَيَادِي»
“I said: My repeated visits have burdened you. He replied: You have burdened my shoulders with favours.”
The first speaker uses thaqqaltu to imply inconvenience. The reply preserves the same wording but interprets the “weight” as an abundance of kindness.
The distinctive effect is not sound similarity alone but accepting the other person's expression in a redirected sense.