While I was in Virginia I came across this funny looking fruit from a nearby tree. I typed in Brain Plant in Google and came up with this:

it’s called monkey brain

It comes from a Osage Orange Tree

It first started growing in America in the states of Texas and Oklahoma

It’s not a threat to nearby plants and it’s considered an old fashion plant

(I did not touch it nor bring it to my face) but supposing it smells like a citrus fruit

It is full of seeds that you can eat but it’s best to stay away from the pulp and extra plant material

source: www.talkingplants.blogspot.com