Earlier in the year, Stephen Colbert and Jimmy Fallon declared each other best friends for only six months.

On 'The Colbert Report' last night, they reveled in their affection for each other, but suddenly realized their friendship should have ended almost two weeks ago.

"It's over Jimmy. I just realize I haven't liked you for 12 days," Colbert declared. "We are now eternal enemies forever!"

"I don't know," Fallon replied. "Forever is a pretty long time."

"Six months?" offered Colbert.

Watch the clip below:

[Colbert Nation]