My daughter Krista and my son-in-law Adam heard the heart beat of our first grandchild the other day and they saw it on their first ultrasound. The did a short YouTube video of the experience and Adam writes about it in his blog.
It's exciting times for them and for us. I haven't found anything yet that competes with parenthood.
I've been practicing saying, "Want to see some pictures of my new grandchild?" It rolls off my tongue pretty easily and I'll have it down by the time Baby Jones comes in the end of June.