What are some things you think of when you see something related to your field outside of work hours?

I'd like to learn what people in their field think of when they see something good or bad when they're not working.

I'm a health inspector, so when I am sitting at a table as a customer, I'll watch people while I'm eating (not purposely staring, but having a look around the place). I recently saw someone swipe their finger under their nose then go to the self serve station to touch about 8 different handles before walking away. Thankfully, I was already done eating.

When I have to walk through the kitchen to the toilets, I take mental notes without meaning to.

As a ex-first responder, unconsciously doing an assessment of someone I'm speaking to (or not) and internally noting how nice and juicy their veins are.

What are some things you come across in your daily life and what do they have you thinking about?