The following EKG represents a very classic case in medicine. Patient came in with typical chest pain that worsens on lying down and is reproducible on palpation. From the initial look, it might look like acute MI but if you look closely, the difference is quiet apparent.
This is a case of classic pericarditis. Notice the diffuse ST elevations and PR depressions in the limb and precordial leads and reciprocal PR elevation and ST depression in aVR.