http://overheadbin.msnbc.msn.com/_news/2011/06/23/6918363-gross-5-things-not-to-do-on-a-plane The summer travel season is barely underway and already we have a suitcase-full of stories about passengers booted from airplanes for being potty-mouthed, improperly dressed or otherwise over-the-line. On June 16, a basketball player from the University of New Mexico was arrested at San Francisco International Airport for refusing to hike up his saggy pants while boarding a US Airways flight. A few days earlier, a children’s book author was removed from an Atlantic Southwest Airlines flight at Detroit Metro Airport after a flight attendant overhead him cursing about a flight delay. In Europe, a passenger stripped naked June 9 and then locked himself in the lavatory on a Frankfurt-bound Iberia flight, prompting the pilot to turn around and head back to Madrid. And in May, a United Airlines passenger flying from Spokane, Wash., to Denver was arrested after allegedly masturbating in his seat. While bad in-flight behavior can certainly get you removed from a plane or even arrested, other onboard etiquette violations are just plain gross. Here are five examples of questionable passenger activities that we hope you steer clear of on your next flight. Toenail clippers An unsettling number of travelers report witnessing other passengers clipping toenails mid-flight. Jill Bazeley of Merritt Island, Fla., can’t forget the “scruffy-looking fellow” she sat next to on a flight from Denver to San Diego. “Through an hour or so of studious picking at his filthy feet, he managed to deposit an unpleasant bounty of skin peelings on the cabin floor,” said Bazeley. On-the-seat diaper changers Alex Kremer of Boulder, Colo., is still grossed out by the couple traveling with their baby in first class on a United Airlines flight. “At one point in the flight, I looked up and saw the mother changing the baby's used diaper right on the seat. She then used her blanket to clean up and tried to hand it to the flight attendant, who rightly told her to handle her own waste.” Scantily-clad seatmates US Airways acknowledged Wednesday that it recently permitted a man dressed in women's underwear to fly, but in 2007, student and Hooters waitress Kyla Ebbert was asked to leave a Southwest Airlines flight because a crew member declared her in-flight attire too skimpy. She was eventually allowed to continue on the flight, but Southwest may have had a point: When Ebbert visited the “TODAY” show wearing the same outfit, rebroadcasts were edited because Ebbert accidentally flashed the national television audience when she sat down. Bawdy browsers Not every X-rated website gets blocked by in-flight Wi-Fi, and it’s easy for travelers to load porn on portable devices. But watching that stuff on airplanes is “just creepy,” former JetBlue flight attendant Steven Slater recently told Overhead Bin. He said anyone uncomfortable telling a seatmate to can the porn should “by all means ask for help.” Stinky snackers Some people don’t bother to shower before heading to the airport. Others think fried chicken, barbecue ribs and other smelly, greasy and messy meals are acceptable grab-n’-go fare. Guess what? They’re not.