▁announ ces ▁to ▁the ▁group ▁that ▁he ▁is ▁planning ▁on ▁taking ▁out ▁his ▁t atto o ▁removal ▁doctor ▁St ella ▁to ▁a ▁movie ▁and ▁is ▁immediately ▁met ▁with ▁disapp ro val . ▁Bar ney ▁mentions ▁the ▁Golden ▁Rule : ▁Although ▁it ▁is ▁known ▁commonly ▁from ▁the ▁Bible ▁as ▁the ▁eth ic ▁of ▁reci pro city ▁(" Do ▁unto ▁to ▁others ▁as ▁you ▁would ▁have ▁them ▁do ▁unto ▁you ." ), ▁Bar ney ' s ▁take ▁on ▁it ▁is ▁" L ove ▁thy ▁neighbor ," ▁which ▁would ▁lead ▁into ▁his ▁Pl atin um ▁Rule ▁as ▁" N ever ▁ever , ▁ever , ▁ever ▁love ▁thy ▁neighbor ." ▁His ▁point ▁was ▁that ▁one ▁should ▁never ▁date ▁someone ▁seen ▁on ▁a ▁regular ▁basis , ▁e . g . ▁someone ▁at ▁the ▁same ▁work place , ▁a ▁next - door ▁neighbor , ▁etc . ▁because ▁such ▁relationships ▁never ▁work ▁out ▁in ▁the ▁end ▁and ▁lead ▁to ▁never - ending ▁suffering , ▁as ▁those ▁involved ▁would ▁see ▁each ▁other ▁constantly . ▁Bar ney ▁begins ▁to ▁outline ▁the ▁Pl atin um ▁Rule ▁in ▁ 8 ▁steps ▁as ▁the ▁group ▁begins ▁to ▁rec ount ▁on ▁their ▁past ▁experiences ▁against ▁the ▁Pl atin um ▁Rule ▁in ▁attempt ▁to ▁persu ade ▁Ted ▁not ▁to ▁go ▁on ▁his ▁date . ▁He ▁uses ▁examples ▁of ▁Marshall ▁and ▁L ily ▁getting ▁too ▁close ▁to ▁a ▁neighbor ing ▁couple , ▁Robin ▁d ating ▁a ▁fellow ▁news ▁anchor ▁and ▁himself ▁having ▁cas ual ▁sex ▁with ▁Wend y ▁the ▁Wait ress ▁at ▁Mac L aren ' s ▁Pub