My exH and I have our two kids 50:50. We have a son and a daughter.
Our son, like many teenage boys, plays a lot of games online. It's his favorite thing!
On "my" days with the kids, my son plays games online in the evening, not just with his friends, but with exDH (and sometimes exDHs friends). I can hear his side of the conversation (its a very small house), and it is obvious he is talking to his Dad, not to a friend.
I know this sounds crazy, but it just makes me feel like exDH is in my house!
Aaargh!