Sam counting his sexual partners in college
This scene is a sure giveaway that it was written by a woman. I doubt there are many men in the known universe (excepting big time womanizers like Charlie Sheen, who undoubtedly lost count in the mid-1980s) who CAN'T instantly tell you how many women they've slept with. If Sam had slept with 8 women, whether they were in college, or before, or after, I guarantee you in real life he would be walking around with that number constantly flashing somewhere in his mind:
8 - 8 - 8 - 8 - 8 - 8 - 8
It's not a personal statistic men forget. Ever.
http://www.youtube.com/watch?v=xbLB3z_kFDw&feature=plcpshare