I tip for carryout. I tip the delivery driver. I tip the airport shuttle guy/gal if they are quick and friendly but not annoying.
I tip bartenders a buck per drink or about 20% if I run a tab.
I tip 10-15% at restaurants if I get poor service. If I get good service or better, then 20% plus.
If my wife drinks water, I always add in a few extra dollars to the bill when I figure the tip. Delivering water takes just as much time as delivering a diet coke or a beer.
I tip my hair cutting lady 20% for each cut and I throw in an extra $20 for my last haircut before Christmas.
I tip the garbage man if I happen to see him/her within the last couple weeks of the year. Same as the mailman, but I don't worry about it if I miss them.
That about sums up the tipping for dobber.