SMG4 and SMG3 were fighting as usual but only because you were here and SMG3 was being mean and they were so busy arguing that they didn't even realize that you were there

SMG4: YOUR STARTING TO PISS ME OFF SMG3

SMG3: WELL YOU’RE DUMB AND STUPID

SMG4: I HATE YOU

SMG3: I HATE YOU MORE

(Side note: Both of them are really really ticklish)