When you say "Loch Ness" with a very thick Scottish accent, the "ch" in loch is quite close to it.
Also the sound is quite common in other languages: "roi" in French, "reisen" in German, ... Even some Spanish dialects like Galego have the same r. Only Castilian/normal Spanish doesn't have it.
OTOH, just ask a Brazilian to pronounce simply "the". The "th" phoneme is quite hard for Portuguese speakers.
Better yet, ask a native from Rio to pronounce any word with a mute "t" or "d". It's hilarious. "Brad Pit" becomes "brahdjee peetchee".