The reason thousands of newborn babies have their own email address.

On Friday’s episode of Hamish and Andy, there was something quite obvious missing.

Andy.

The 36-year-old was away for the show, so co-host Hamish took it upon himself to introduce a concept he’s long kept to himself: The Dad’s Club.

It was late notice, however, and a lot of dads were busy. So while Hamish was joined by celebrity dads like a Peter Helliar and Todd Sampson for a segment each, he also had to settle for Ed Kavalee, whose child isn’t technically out of the womb yet.

The actor and radio host is expecting a baby later this year with his wife, Biggest Loser trainer Tiffiny Hall, and told Hamish he’s been thinking about sentimental “time capsule” ideas for when his baby is born.

Hamish shared his own clever ‘handwriting’ project he’s been working on with Sonny, before opening up the conversation to their listeners.

“Have you had a crack at making one of these long-term pay-off sentimental ideas for a kid?” Hamish asked.

Their first caller, Heath, had a beautiful plan for his four-year-old son Oliver. "I opened up an email address for him the day he was born... and I send him emails all the time," he said.

"With all those funny moments you'll never remember when he's older. Because you can do it on your phone instantly. You can do photos and little videos and all these wonderful little things he'll get when he's much older. As well as grandparents. He's unfortunately got grandparents who were alive when he was born that are no longer there."

Hamish conceded that this sounded like "really good dadding," but did want to know whether Heath was tempted to use Oliver's email to receive all those spam emails no one wants to get. Heath, very diplomatically, said no.

The next caller said she bought a gold bracelet for her daughter that she intended to add charms to every year. Over time, however, she lost interest, and now she just wears the bracelet herself.

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Another caller, Jase, said he bought a height chart to track the growth of his two young sons. Now three and six, Jase has never, ever marked their heights on it.

Oops.

Finally, Tina shared that at her daughter's first birthday she asked everyone to write what they thought she'd be doing by the time she turned 21. Unsurprisingly, some family and friends didn't take the idea as seriously as she had hoped.

People have some very unique, touching ideas to chronicle their children growing up. But unfortunately, it looks like the demands of being a parent often get in the way of following through.