The anonymous Tips for Jesus saints struck in Tucson on Christmas Eve, slipping a $1,500 tip to a bartender at a Foothills Mall restaurant before giving a $2,000 tip to a bartender at the Ritz Carlton Dove Mountain.

“I’ve done this a long time and that’s the largest percentage I’ve ever seen,” said Grant Warren, a manager at Thunder Canyon Brewery, where bartender Danielle Herrington  got the $1,500 windfall on a $21.75 bill. The receipt was signed “Tips for Jesus” and had “God Bless!” and “Merry Christmas!” written in all caps.

Over at the Ritz, Ignite bartender April served the generous tippers a half dozen drinks, an order of chips and guacamole and an $18 hamburger — totaling $106.48 — and was given a $2,000 tip. Her receipt also was signed “Merry Christmas!”

The tippers behind Tips for Jesus — reportedly spearheaded by former PayPal Vice President Jack Selby — have been dropping obscenely generous gifts — from a couple hundred dollars to as much as $10,000 — on bar and restaurant servers around the country since at least September. The anonymous donors, sometimes traveling in pairs or small groups, have documented the giving spree on an Instagram account that describes their mission as "Doing the Lord's work, one tip at a time."

Selby was outed as the Tips For Jesus instigator in early December by ValleyWag, Gawker.com’s Silicon Valley site.