I usually don't care about pdb, but....
It's about 100 degrees in LA, the AC is barely on, the plane is fully boarded (early).
No FA around.
I walked up front to really nicely ask for water.
In the galley, I found the two FA's taking a selfie. It really irked me, and I got snarky, saying, "are you doing selfies or pre-departure beverages?"
They apologized profusely.
They brought me water. No one else got anything.