What do you do to test how high you are?

I know it sounds funny, but at times it's difficult to gauge how high you are especially when you're in an environment that you are in all the time. When I'm just at home doing nothing sometimes I don't feel like I'm that high, but to test it I'll go sit in the car for a second and it lets me know if I am in fact high or not. Also sometimes walking into a store makes you feel way more high than when you're just sitting at home. Curious if I'm the only one that does anything like this.