I like sub-satoshi payments with LN 

https://bitcoinmagazine.com/articles/sold-lightning-network-art-auction-goes-lowest-bidder/
Millisatoshis? So Bitcorn can easily go to over $1m now without running into the problem that 1 Sat = 1 Cent. Weeeeeeeee?

Quote
The winning price was the first of several 1 millisatoshi bids (one hundred billionth of one bitcoin). At the time of writing, the US-dollar denominated value of the bid is approximately $0.000000037.
https://bitcoinmagazine.com/articles/sold-lightning-network-art-auction-goes-lowest-bidder/