When I go to McDonalds or any other drive through fast food place I pay in cash, such that the change they would give me back would be at least a 30% tip.

I let them gather the change to give back to me (so they’re not distracted and the till has been properly managed) and then when they go to give me my change I say “That’s tip”, and give a huge thumbs up (I’m not sure where cameras face or if they record audio, and so I want to make it clear in any way that I can that the worker didn’t just steal my change).

I’m not saying that everyone should do that, but those workers are underpaid and if it costs me $10 to make someone’s day a little better, while they’re saving me the time and effort of cooking my own meal, for me that’s money well spent.