I grow all of my mints in pots for this reason - they spread like wildfire!!! I currently have spearmint, peppermint, orange mint, Indian mint, Chocolate mint, and catmint all going in pots - they're getting large (we've had funky weather), but the trailers can't quite reach the soil. I may need to put them on a table.
On the "herb infestation" level, my lemon balm took over everything last year - we ended up with lemon-scented purple ruffles basil (not a bad combination), and lemon-scented tomatoes. The lemon balm overgrew the tomato plant by about a foot.