For example , there were moments such as Irwin R. Schyster tearing up Tatanka 's headdress , the different `` Undertaker sightings '' ( during the Undertaker vs. Undertaker storyline , leading up to SummerSlam 1994 ) ; and characters like Duke `` The Dumpster '' Droese , Doink the Clown , or Thurman `` Sparky '' Plugg . For instance , events occurred such as Irwin R. Schyster tearing up Tatanka 's headdress , the various `` Undertaker sightings '' in mid-1994 and characters like Duke `` The Dumpster '' Droese , Doink the Clown , or Bob `` Spark Plugg '' Holly .