Seth Collins carries out the mission of his late brother Aaron who in his will instructed his family to leave "an awesome tip" ... he travels around the country and gives out $500 tips to servers.

Last year, Seth Collins set out to give $500 tips to waiters and waitresses in all 50 states. So far, he's given out 54 tips. He hopes to reach 100.

Collins, from Lexington, Ky., made the goal to honor his late brother, Aaron Collins, who in his will instructed the family to leave "an awesome tip."

"And I don't mean [a 25% tip]," he specified. "I mean $500 on a f***ing pizza for a waiter or waitress."

The 29-year-old passed away just three weeks shy of his 30th birthday, but his wish endures.

After the video of Seth Collins giving out the $500 tip went viral, the Collins family set out to keep the tradition going.

They solicited donations in Aaron's honor, and in just one month, they raised more than $30,000. Today, that number has risen to nearly $60,000, according to WHAS11.

Each surprising tip has also helped the Collins family cope with their loss.

"Most people, when they lose a loved one, their family grieves with them, their friends grieve with them, and we've had the whole world to grieve with us," Tina Collins, Aaron and Seth's mother, told LEX 18. "So, that's pretty special."

"Aaron's Last Wish" Facebook page has documented Seth Collins' wish-fulfilling efforts...