Oh,man, that totally blows, BigBreathless...(pun not intended

) The same thing happened to me a few years ago the first time i purchased some Cattex 55" hearts. I just pulled one out & attached it to my electric balloon pump & started inflating. It blew up to maybe about two thirds its rated size & it was more round than heart shaped. The humps of the heart refused to inflate

Next thing i knew... KABLAMO! My Russel terrier in the next room started barking like crazy! It was like a freakin shotgun blast!

The trick is to partially inflated the balloon, clip it shut & work the humps by squishing & forcing the air into them without stretching the center part between the humps. Its a little tricky but by doing that the balloon should blow up more consistently