We did, but none of them were on an airfield. The C17 went to ACEH, their total gross on landing was probably close to or under 300,000#. A 777-200ER weighs 300k empty.
Perhaps the ‘aviation geek’ was practicing short landing and takeoffs with his high tech ‘hobby’ setup at home. Remember the oversized planes that land at the wrong airports all the time. The passengers, their luggage and all non essential pieces are stripped off and the pilot takes off hot. One of those happened not too long ago with a 777 IIRC.