Stumbled on this, which may be of interest to fans of those involved: http://happyeverafter.usatoday.com/2015/11/18/donna-kauffman-ncis-episode-9-day-in-court/
"McGee’s revelation that one of his previous gf’s had a phobia about being tickled with a feather. Tony instantly surmises, given the relative short list we’re discussing when it comes to McGee’s old girlfriends, that the feather phobic would be none other than Abby"
...
"She says it’s private girl talk, forcing Tony to wield — wait for it — yes, the biggest, fluffiest purple feather ever. Oh, Tony. Abby immediately turns on McGee, but they’re not letting her distract them from her mission. Cornered, she gives up."
"McGee’s revelation that one of his previous gf’s had a phobia about being tickled with a feather. Tony instantly surmises, given the relative short list we’re discussing when it comes to McGee’s old girlfriends, that the feather phobic would be none other than Abby"
...
"She says it’s private girl talk, forcing Tony to wield — wait for it — yes, the biggest, fluffiest purple feather ever. Oh, Tony. Abby immediately turns on McGee, but they’re not letting her distract them from her mission. Cornered, she gives up."
