We know that Diana tried to pick up the phone one day and she overheard Camilla telling Charles that she could not be with him because it was her time of the month--to which he replied " oh , to be a pair of your knickers " and she said -- " you don 't want to be my knickers , darling--you wish you were a tamponnnnn " Unfortunately for Diana , this call was also being taped by someone who turned it over to the tabloids .