Oh, that was cute! They don't make 'em like that anymore (and don't we all wish that they did?).
Btw, the Wacky Billboards were also on 2014 S1 and 2015 S1. All four of these series had six billboards, both as card backs and inserts (except for 2015 S1, where two of the Billboards (Motel 666 and Indirect TV) were only released as card backs (base cards #50 and 52, respectively) but not as inserts).