I used to work on Harrier and remember being told about the embarrassing occasions (infrequent thankfully) when the main landing gear has fallen off. Still, on Harrier you can still land as the nose and outriggers are stressed for this case - just VERY carefully.
And just to show my spotter credentials I should point out that the F-15 has an ACES-II seat, which was a McDonnell Douglas design. Only the US Navy use MB seats (except in the AV-8B). Neep neep neep where's my anorak.