At some conventions, you can have a CGC representative accompany you to a signing; he will witness the item being signed, and your comic will be eligible to receive a "Signature Series" label.
Some creators who charge for their signature will charge a higher fee if the signing is witnessed.
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The GIF of me making the gesture seen 'round the world has been viewed over 444 million times! 
If only I had one cent-- make it half a cent-- for each view... 😭
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