Penn & Teller join Las Vegas for AFAN AIDS Walk — PHOTOS
Penn Jillette spoke to the crowd prior to the start of the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas on Sunday.

Raymond Teller , front left, along with Penn Jillette wait for the start of the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

Penn Jillette speaks to the crowd prior to the start of the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

Penn Jillette, left, speaks to the crowd as Raymond Teller looks on, prior to the start of the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

Raymond Teller , front left, along with Penn Jillette, center, wait with other particpants for the start of the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

Participants walk the course during the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

Participants walk the course during the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

Participants walk the course during the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

Participants walk the course during the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

Participants carrying team signs, walk the course during the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

A large crowd of participants walk the course during the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

A crowd of participants walk across the overpass on W. Sunset road as part of the course for the Aid for AIDS of Nevada (AFAN) hosts the 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

A crowd of participants walk on West Sunset road as part of the course for the Aid for AIDS of Nevada (AFAN) hosts the 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

A crowd of participants walk back across the overpass on West Sunset road as part of the course for the Aid for AIDS of Nevada (AFAN) hosts the 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)

A large crowd of participants walk along the course through the streets of Town Square during the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas, South Las Vegas Boulevard, Las Vegas, Sunday, April 19, 2015. (Donavon Lockett/Las Vegas Review-Journal)
Penn Jillette spoke to the crowd prior to the start of the Aid for AIDS of Nevada (AFAN) 25th Annual AIDS Walk Las Vegas at Town Square Las Vegas on Sunday.
The walk is AFAN’s largest fundraising event, and Penn & Teller again signed on as grand marshals and leaders of the Penn & Teller Challenge AIDS Walk Team.
For walkers who raised $250, Penn & Teller said they will match it. Last year, the event saw an estimated 11,000 walkers.