Michael Phelps set a new world record on Thursday night at the U.S. national championships by finishing the 100-meter butterfly in 50.22 seconds.

“It really shows anything can happen if you put your mind to it,” Phelps said. “It feels good to get a best time.”

Phelps broke the previous record of 50.40 which was set by Ian Crocker at the 2005 world championships in Montreal.

“Crock had a ton more first 50 speed than I did. That’s something I’ve really been working on,” Phelps said. “I’ve always been able to come home pretty strong. I finally got the front half a little bit faster. If I can get that even faster, I’ll be in better shape.”

Phelps celebrated the record by smoking a joint.