On Sept. 27, Iowa couple Makenzie and Steven Schultz endured terribly slow service at the Kazoku Sushi restaurant in Cedar Rapids, Iowa.

On Facebook, Makenzie wrote that the server took 20 minutes to get them water, 40 minutes for an appetizer, and more than an hour to get their entree.

Instead of tipping their server as little as possible, the couple said they left him a $100 tip for a meal worth $66.

Makenzie shared the receipt on her Facebook page, along with the heartwarming reason for their generous tip.

The post went super viral, garnering over a million likes and more than 150,000 shares on Facebook alone.

Makenzie, a distributor for It Works Global, a skincare and nutrition company, told BuzzFeed News she never expected such a massive response to her post because there have been other viral stories about bigger tips.

What distinguishes theirs is that the couple left a huge tip for horrible service because "we saw the whole picture," Makenzie said in a phone call.

"People have been in that situation where it's not really the server's fault. They realized they could have been more compassionate to a server who they might have tipped poorly," she said.