My favorites are probably optimus vs shockwave as just seeing optimus fly in slashing everything, then doing a somersault while making his fists "brass knuckles" and killing shockwave seemed so badass. Optimus vs megs vs sentinel. Seeing megs vs prime was alright in movies before but throwing another prime into the mix just seemed too much. When megs comes in and saves optimus and was just like "who would you be w/o me, prime?" To which he responds "time to find out" and kicks megatron's ass literally singlehandedly (because ya know...one arm) and then take out sentinel. Just... oh man. Optimus vs the fallen, megs, and ol' 'screamer. This one really threw me for a loop because here, 10 year old me thought prime was done for after the forest battle, and then boom, hes back, better than ever, and was all, "lets roll!" Before blasting off. Then of course we later get "THWARTH-THCREAM!" and "give me your face"