The bombardment of beryllium by carbon is investigated by a dynamic Monte Carlo simulation to demonstrate the complicated nature of this type of simple system by considering only collisional effects. Furthermore, the sputtering yield dependence on the incident angle is investigated for O-BeO, Be-Be, and C-Be systems at 3 keV. Experimental data on the influence of boron in carbon targets on the sputtering yield for bombardment by 1-keV deuterium are provided.