By the way, the 'gear up' landing by the Saab 105 at Farnborough mentioned by Dixi88 was '72 not '74; I remember as this was the only Farnborough I didn't go to between '62 and 2006, the last 17 of these I had to attend as I worked there! At the 1970 show, I witnessed Pee Wee Judge losing his life in the Wallis gyrocopter, and the next one I went to was the '74 one I mentioned earlier.
Honey Monster - who arrived at Farnborough several years before me - told me the Saab 105's pilot realised he hadn't lowered the gear just before he touched down and selected it down, but it didn't have time to cycle before the ominous scraping noise began. When they lifted the aircraft with a crane, the gear dropped down by gravity and locked!
Honey Monster was at Farnborough when the Breguet Atlantique crashed on the RAE canteen in 1968 after an asymmetric flypast, resulting in severe limitations on asymmetric displays (ie they were banned).