They want what they want...when they want it
and clearly, Oliver wanted to sit in that particular chair, with you perched on the edge. If he'd wanted you to have more room, he would [kindly, I might add], have given it to you
I think all us humans are in the same boat; last night I thought Imogen might like her supper in her room [my bedroom] so I took up her dish with some nice Tuna Imperial and a tea towel to put on the duvet...she likes to eat her supper on the bed...I put it in front of her, she looked at it like it was poison, huffed at me, jumped off the bed and stood at the door swishing her tail about with her back to me
. I still don't know what it was she objected to!
Still, Humphrey scoffed it - he's such a trooper