When Aaron Collins died this month three weeks after his 30th birthday, he asked his family to do something special: Leave a large tip for a waiter or waitress.

"Leave an awesome tip (and I don't mean 25%. I mean $500 on a f------ pizza) for a waiter or waitress," Collins, of Lexington, KY, wrote in his last request to his family.

Three days after Collins' death on July 7, his family fulfilled the wish by walking into a local pizza restaurant and, after eating, they handed the waitress $500 and told her the story.

They posted a video of it on YouTube.

"My brother passed away late last week and his last wish -- he didn't have the money to take care of himself so we took donations -- he asked that we go have pizza and leave the waiter or waitress a $500 tip," Seth Collins tells the shocked server, handing her the cash.

"Are you kidding me?" the waitress asks several times, before pledging to share the money with the kitchen staff.

"I don't even know what to do. That's crazy," she says in the video. "You know, I'm going to be telling this story for the rest of my life."

Seth Collins wrote on a blog, aaroncollins.org, that his brother "took great joy in unexpected kindness." He didn't say how Aaron died, and noted his brother didn't leave much behind, so they raised the money online to tip the waitress.

They've raised $1,000 and plan to do a second $500 tip.

"If we continue to receive money, we will continue giving these gifts randomly, so that in his death he can touch the lives of many more people than he had even dreamed of doing in life," the website says.