Glitch

Hi everyone. I have a MyTouch 4G. I use ChompSMS to text people. So I decided to take a picture of my baby cousin on Christmas, and I captured the perfect moment where she looked loaded. I thought it would be great to show my friends. I went ahead and started sending it to all my friends which have iPhones on the AT&T network. Upon sending the MMS, all their iPhones started glitching out and froze. They all had to restart their phones or their device just restarted on their own, and their devices just kept searching for data. They never even received the message from me. Their phones have been draining battery a lot faster. I was just wondering if anyone can help me confirm this?