Where were you on the morning of November 1st? If you're like the women featured on last night's How I Met Your Mother, you might have been making the Walk of Shame after partying hard in the West Village.

Or, you might have been making up lies about a "Halloween hookup" because you were stuck doing something even more embarrassing. Below, Robin shares the story of hooking up with Randy (played by Will Forte) who had just been fired by Marshall earlier in the day.

Finally, Robin reveals what she was really doing — filming a commercial for adult diapers.