I watched some videos and found out that you can teach betta fish to jump out of the water and take food from your finger, (deep breath:friendly_wink There are some others too. If you have youtube (which most of you probably have) type in "7 tricks you can teach your betta fish" or something like that and the one I saw might come up.
I dont want to ruin the mood but do you know what sized tank they are in because it look like 2-3 gallons which is too small for two bettas. I would recomend putting some live plants in there and getting a 10 gallon tank and splitting that in half so they both have about 5 gallons. They seems to be pretty healthy and im not saying you have too i think the fish may enjoy it more and it may be more pleasing to look at. Again, im not saying your doing anything wrong i am simply sugesting the idea.