In this talk, I provide a new explanation for the well-known, cross-linguistically frequent phenomenon whereby anticausatives and reflexives are (or can be) expressed with the same morphology. I focus specifically on the role of the -st morpheme in the Icelandic sentences in (1) and (2).

(1) Rúðan splundraðist.
window.the shattered-ST
'The window shattered.' (anticausative)

(2) Bjartur tróðst gegnum mannþröngina.
Bjartur squeezed-ST through crowd.the
'Bjartur squeezed (himself) through the crowd.' (figure reflexive)