Great minds think alike

Prov. Very intelligent people tend to come up with the same ideas at the same time. (Used playfully, to commend someone for expressing the same thing you were thinking of; implies that you are congratulating that person for being as smart as you are. Also Great minds run in the same gutters, a casual and jocular variant.) Jill: Let's ride our bikes to the store instead of walking. Jane: I was just thinking we should do that, too. Jill: Great minds think alike.