Ok so I was at Meijers returning a 20 gallon tank hood because I thought that this old tank I had was 20 gallon when really I later came to find out is 29 gallons, but anyway when I was returning the hood somehow me and the lady behind the counter get talking about betas and she told me about how she would put a mirror in front of her beta and it would puff up because it thought it was another one. But she said she did to many times and it gave her fish a heartattack and that was when the other lady behind the counter goes "I didn't know that fish had hearts"....... 
But yea thats pretty much it I thought it was pretty funny

But yea thats pretty much it I thought it was pretty funny