I remember in TAR12 Ronald got himself into a tiff with Nic & Don about ticking off a ticket counter lady at Osaka Airport.
As for Charla & Mirna, They were involved in the most feuds ever in TAR history.
TAR5• Marshall & Lance v. Charla & Mirna (out of spite)
• Charla & Mirna v. Colin & Christie (out of spite)
• Jim & Marsha v. Charla & Mirna (seems non-existent, but Marsha refused to help C&M look for good bus departure times to Punta del Este)
TAR11• David & Mary v. Charla & Mirna (out of Mary's pettiness)
• Charla & Mirna v. Rob & Amber ("Level 5!")
• Charla & Mirna v. Warsaw (nobody came to help in the beginning, but they still held strong!)
• Charla & Mirna v. Teri & Ian ("Security!" at the ticket counter)
• Charla & Mirna v. Eric & Danielle (Internet use for flights to Kuala Lumpur)
• Dustin & Kandice v. Charla & Mirna (stand-by list drama/"She's so manipulative!")
• Charla & Mirna v. the Mini Moke
But best of all...• Charla & Mirna v. each other ("Charla, we don't have time for a stepstool!"/Polish sausage Intersection/Hawaiian currents paddling)