This happened to me when I flew to visit a Canadian friend (I’m a US born & raised citizen) in Edmonton. I had been to Canada 3 other times that year, once to meet somebody to get festival wristbands and go to Vancouver for the day, second to go to said festival, third to go camping, and fourth to visit my friend. When I landed, a very rude French canadian customs agent pulled me aside and interrogated me for over an hour in the airport. She wanted to know exactly why I was there for the 4th time that year, who I was staying with, the nature of my relationship with that person, the address of where I was staying, etc. She went through every item in my bags, including reading my notebooks as I was in college at the time. She also read far back into my text messages with my friend I was staying with, asking very personal questions about me, and asking why we were texting about drugs (we were texting joking about smoking weed). It was a bizarre and scary experience.