Typical low end food joint scenario: (my area anyway)
Go up to counter -- noticed by by youngish buffoon behind counter -- youngish buffoon may, or may not, acknowledge verbally -- youngish buffoon walks off -- youngish buffoon returns a minute or so later -- YB may, or may not, verbalize "May I take your order." --- I give my order -- YB will not repeat my order back -- YB instructs that I owe whatever -- I slide in my card, a receipt prints, YB hands me receipt and a cup, walks off (No thank you, it'll be up in a minute, etc.) -- I make my own drink, I get my own napkins, condiments, sit down -- I watch intently as YB will not announce that my order is ready, but he will eventually deposit a tray with my food on the counter, and walk off -- I retrieve my food from the counter. There is a 20% chance my order is wrong.
I am supposed to tip Youngish Buffoon. LOL