In recent times, Linguistic Landscape (LL) research has been extended to cover several variables, domains, modes,
and geo-political contexts. Arguably, humour remains understudied in LL research. This article, therefore, examines incongruities
in LLs using a corpus of digital signs and incongruous inscriptions gathered across several mediums in urban Ghana. Drawing on
the incongruity theory, we examined the levels of incongruities in the corpus. The study found that incongruities in public signs
in urban Ghana manifest at the lexical, grammatical, semantic, and phonological levels. We conclude that the resolutions of these
incongruities induce laughter and humour in the audience with the shared sociolinguistic knowledge, and humour intelligence. The
findings have implications for the theory on humour and the research on LL.