What to Buy in US (Everett WA) Before Crossing into Canada

Reminds me of a online youtube couple "long long honeymoon" I think, they did a episode on crossing the border had the usual helpful hints - but heres where I laughed as they pulled into customs while recording (no no #1) with sunglasses on (no no #2) I wondered if the husband was going to shut down the 6.0 ford .
In the entire video fo 'hints' nothing was said about the biggies
- NO recording devices
_ NO sunglasses
-shut off your diesel if loud.
-turn OFF the radio
simple thoughtful will get you though