Why did my toilet empty itself?

I heard 3 loud gulp like sounds coming from my toilet and I went to go check it out and there was water all over the floor. Toilet bowl was empty, but tank had water. My other toilet had very low water level in bowl but water in tank and there was a small amount of water on the floor. It seems it drained from the... show more I heard 3 loud gulp like sounds coming from my toilet and I went to go check it out and there was water all over the floor. Toilet bowl was empty, but tank had water. My other toilet had very low water level in bowl but water in tank and there was a small amount of water on the floor. It seems it drained from the bottom but what would cause this to happen?
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