Great minds think alike
Definition 1 of 1
Pro Tip 1/3Coincidental agreement
Used when two people have the same thought independently and unexpectedly. 
We both decided to wear red today—great minds think alike!
Pro Tip 2/3Light humor
Often said jokingly when the similarity in thinking is about something trivial or humorous. 
You got the same wrong answer as I did—great minds think alike, huh?
Pro Tip 3/3Social bonding
Helps create a feeling of connection or shared intelligence between people. 
You also chose this quiet spot for lunch? Great minds think alike!