If you need further convincing that Barney is the awesomest awesome who ever suited up, YouTube also handily provides a one and a half minute summary of The Essential Barney (all clips taken from the first few episodes, I think).
I defy you to watch both of the above and not think Barney deserves some Captain Jack Harkness. So:
Title: Free Beer
Pairing: Barney/Captain Jack
Continuity: How I Met Your Mother: Set early/mid season one. No spoilers. Doctor Who / Torchwood: Set before season one of TW. Mild concept spoilers; no plot spoilers.
Warnings: None (see policy)
Summary: "It's like Barney has a good twin," Robin whispered. "A good, hot twin."
Please click here to read Free Beer on AO3.