Neckbeard: a man who is socially inept and physically unappealing, especially one who has an obsessive interest in computing.
Also often associated with neck hair growth and may refer to overweight unkempt internet users with strong political views.
In other words probably 1/4 of the users here
If pizza is between $15-$20... give a $20
$20-$25 give $25
Never expect any change and you never have to give more than $5, I can live with giving delivery dude $5
If you have $40 and order a $21 pizza..... you shouldn't ordered delivery.
They don't keep change like they used too