...and no I'm not talking about crazy cat ladies. Exoplanet HD 20782 has an orbital eccentricity of 0.96 - an orbit more like a comet's than a planet's. Except it's the size of Jupiter.
Needless to say, no habitability here, probably in the entire system with that going on, but scientists are hoping to study what happens to the atmosphere when it swings by the sun. Giant comet tail, maybe?