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The thumbnail references my "10 Violins" paradox:
1. Put a violin on a table.
2. Leave it there for 10 minutes
3. Remove it from the table and travel back in time to 1 minute ago
4. Take the violin on the table.
5. Repeat the steps 3 and 4 eight more times
6. Travel back to the present.
7. Put all 10 violins on the table
8. Realise that all 10 violins are the same violin
NOTE: Times are exact times, you won't want to end up with two of yourself or nine violins!