Swedish is a good one. Honestly, it's probably the language I should have learned; Norwegian has a lot of things that make it tricky in ways that Swedish probably doesn't have. (Though Swedish probably has idiosyncrasies of its own....)

With people who are fluent, it's possible of course, but I'm not so sure about learners... I've had some luck when coming across Swedish writing in casual contexts, but I always have to doublecheck it because some words mean completely different things.