I give an overview of recent results obtained in the study of collisions of discretespatiotemporal optical solitons ("iscrete light bullets". I will consider discrete light bullets formingin both one-dimensional arrays of weekly coupled nonlinear waveguides and in two-dimensionalphotonic lattices. These nonlinear photonic lattices can support continuous-discrete spatiotemporalsolitons, which are stable in a broad region of their parameters. The generic collision scenariosinclude: (a) soliton fusion (soliton merging), (b) soliton spreading, (c) quasi-elastic (symmetric)scattering, and (c) strongly asymmetric collision outcomes.
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