Did one of mine this weekend and posted a HELP ME! when it wouldn't pop out. I beat on it through the center of the hub for 2 hours or so. Eventually I took a socket extension over the hub angled against the cuff and wailed on it - it came out pretty easily (maybe 30-min) from that angle. Mine war rusted to the splines as previously mentioned. I hit it with PB blaster which may have helped after it sat (with me beating on it) for a few hours.

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT