Wait til you get a load of Alyson Hannigan like you've never seen her before when she dresses as a stripper version of Lily. No, it's not Lily herself, just a look-a-like.
The Barman and Robin are struggling a bit when Barney is not being a sensitive enough of a boyfriend, so he eventually enlists in Ted's class for help.
How I Met Your Mother is the story of how Ted Mosby met his wife as told to his children. Yes, it's a very long story that will take many seasons to tell.