Once my mom asked me to clear out a planter box that had become overgrown because she wanted to plant tomatoes. I pulled up this 3ft tall stalk plant with little purplish flowers, and as soon as I shoved it in the trash bag, the cat came running from the other side of the house and dove face first in the bag. After a minute or so, it was backing out of the bag with the stalk between his teeth dragging it out of the bag and once it was out of the bag started nibbling on it and rolling around on the plant. Looked up what the plant was and apparently I had just pulled up his catnip grow operation. When he came down, he was mad at me for a few days.