Simple capacitor circuit question

[saturated]

Behold

 

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If I input a sin wave to Vin I can observe Vout with a same waveform smaller amplitude slightly out of phase

In an attempt to watch a play by play I try to replicate each event one at a time to see what happens

So if I remove the sin wave input and replace with positive DC on Vin I do not under any circumstances get any charge on the neg terminal of C1

Trying to understand the principles here I ASSumed that when a nice healthy positive charge appeared on one side of the capacitor it would attract a bunch of hungry negative electrons to the other side 

If I go back to the sin wave input I can clearly see Vout going negative via scope and multimeter 

Watching both right now swing from positive to negative over and over

Yes in both circumstances I'm connecting to both Vin terminals

The reason I ask I thought when a sin wave is input to Vin the negative side of the capacitor charges up negative when the input sin wave is positive

Yeah I know this is confusing

Thank you for your patience 

Update: I figured maybe the bottom inputs change depending on which voltage is input but the bottom input stays at ground when the sin wave is input 

Oh well back to the grindstone

1% inspiration and 99% perspiration