Negotiating

Tristan has learned the art of negotiating...kind of...
There are some things that I'll let him make decisions on, and if he is happy about it, I will let him negotiate with me too.  The other night I was telling him that it was 5 minutes until bedtime.   He asked if he could have 10 minutes instead.  I said, "No, just 5."
T: 10.
Me: 5
T: 8
Me: 7
T: 8
Me: 7 1/2
T:  Yeah!  7 1/2
M:  Ok
T: No!  5 1/2
M: Even better!