So far, the funniest examples of r-l minimal pairs I'd heard were "rice/lice" and "election/erection." I got another one.
I was talking with another Korean friend about kalbitang, which I could loosely translate as beef rib stew. My friend told me how her American roommate seemed disgusted by the dish when she had first described it to her. I was puzzled. What's so disgusting about ribs? Then she explained: she had meant to call it "rib soup" but what her roommate heard was "lip soup."
...yeah, I must admit, I enjoy tripes, tongues, kidneys, hearts, etc., etc., but the idea of eating cow "lips" did not appeal to me either.