I suggest one of the following two remedies.
1) Rub your Brother in-law's head on the affected area until you get tired, or his teeth score the glue off the counter top.
2) If that doesn't work, try the "Hammer" method, of repeated smashing his head into the corian (I suggest using his hair for the best grip). This should loosen the glue.
Either method will leave you feeling supriseingly better about your situation.
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