See the sprout with the seed coat still on it? (The little green thing next to it is a weed.)
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It's a pepper. I have had a lot of seeds do this this year. In years past, these usually dry out and die. The leaves never make it out of the seed coat. I don't know why this happens; maybe because the soil is too cool or too dry?
Anyway, I have saved every one of these by dripping a drop of water onto the seed coat, 2-3 times a day. It keeps the coat from drying out, sticking to the seed leaves. This little guy is now a cayenne pepper seedling.