When you master the Dark Art of helping DS1 with his homework while DS3 is trying to climb on your lap while you are feeding DS4 and DS2 is shouting to get his bum wiped (don't ask, he is 7, but has bum issoos
)
When your 18 month old DS4 manages to do a face plant onto hard, hard pavement with you standing right there, because you are distracted by the other 3 trying to commit suicide by looking like they are going to run across the road 
I must not really have a Large Family because I just don't care about socks all that much
.
And yy to the photo thing: all my babies look the same AND they have worn the same outfits over and over, so the only way to identify them on some photos is by accessories: "I only got those glasses in 2004 so that cannot be DS1" "We decorated the living room in that colour in 2008 so that must DS3" etc
.
And stones, sticks, dead bees
, seashells, conkers (last years!), pinecones seem to just appear whereever DS3 happens to be... Today I found a Fruitshoot [sic] top, an mercifully empty nappybag and a.... large stone in the pocket of my work jacket.