“Jenkins” — Guest star Amanda Peet, left, is the co-worker Marshall (Jason Segel) is always telling funny stories to Lily about on the CBS series HOW I MET YOUR MOTHER, Monday, Jan. 18 (8:00-8:30 PM, ET/PT) on the CBS Television Network. Photo: Eric McCandless/FOX ©2009 Fox Television Studios. All Rights Reserved. —sent to tv guide 12/15/09 hw–