Per WP:

Supreme Court nominee John G. Roberts Jr. has repeatedly said that he has no memory of belonging to the Federalist Society, but his name appears in the influential, conservative legal organization's 1997-1998 leadership directory.

Other things John Roberts "has no memory of":

• Joining the Columbia House record club

• Where he parked

• Buying a red pleather miniskirt

• 1982

• Second verse of "Star-Spangled Banner"

• That time he killed a man.

Roberts Listed in Federalist Society '97-98 Directory [WP]