15 Mind-Blowing Facts You Didn't Know About Sonic The Hedgehog
12. If You Stand Around Long Enough In Sonic CD, He'll Kill Himself
Possibly as a purist reaction to the death of cartridges and being forced onto a CD himself, if you wait around in any of the levels within Sonic CD, Sonic will start tapping his foot as normal - only to eventually leap off the world geometry into the abyss below, killing himself.
Bit much, isn't it? Maybe he had a vision of what Sonic Boom was going to turn out like.