Coffee Dad is a novelty Twitter account that has been discussed on the show many times.
The account presents itself as a typical father with a relatable interest in coffee, as well as the procuring and processing of said drink. 99% of the tweets are simple phrases or sentences regarding his interest in coffee, sometimes with an extraneous hashtag or two.
However, once in a while the account will strongly shift gears to include morose or even menacing lamentations about the father's dead son.
According to Lars, this is his favorite Twitter account.