Spanish clitic sequences, long thought to be strictly ordered, turn out to show variation in the order of first and second person pronouns with the reflexive clitic se. This variation shows up in dialect data spanning the 20th century, from the Atlas lingüístico de la Península Ibérica (www.alpi.ca) and other linguistic atlas surveys as well as semi-directed interviews with older rural speakers from the Corpus oral y sonoro del español rural. The analysis of nonstandard clitic sequences reveals an implicational asymmetry, whereby nonstandard orders with first person singular me imply those with second person te but nonstandard sequences with te can occur alone, without those involving me. Such a person asymmetry in turn suggests that accounts of clitic ordering, whether they rely on templates, syntactic movement or ALIGN constraints, must pay attention to the internal morphological structure of pronominal paradigms — something we only notice if morphosyntactic analyses and geolinguistics mutually inform one another.