Every tiny weapon that allows spammers to knock you down. I'm okay with getting knockdowned by mauls, but those little hammer-thingies, staffs, cudgels, whatsoever are fast as fuck and knock you down waaaaay too often.
Especially horrible in combination with shields: Knobbed Mace, Flanged Mace, Winged Mace, Iberian Mace, MACE MACE MACE MACE MACE