After the fly landed on Pence’s head, the fly beats launched by the Biden-Harris campaign quickly sold out.

During Wednesday night’s debate between Vice President Mike Pence and Senator Kamala Harris, a fly fell on Pence’s hair and stayed there for two minutes, apparently without the vice president noticing,media CNET reported. But the audience found out, and so did Biden-Harris’s campaign.

After the fly landed on Pence's head, the fly beats launched by the Biden-Harris campaign quickly sold out.

The campaign immediately took the opportunity to put the fly on its official website for sale. The $10 fly racket has sold nearly 35,000 pieces, and according to the campaign, it is now sold out.

The blue flies were printed with the words “Truth over Flies” and “Biden-Harris.”

During Wednesday night’s debate in Salt Lake City, where the fly briefly rested on Pence’s hair, Biden’s official Twitter account immediately posted a photo of Biden holding a fly and wrote, “Invest $5 to help this campaign fly.”

After the fly landed on Pence's head, the fly beats launched by the Biden-Harris campaign quickly sold out.

Fly shoots quickly sell out. “Oh, yes, we did.” McNamara tweeted.

After the fly landed on Pence's head, the fly beats launched by the Biden-Harris campaign quickly sold out.

Not everyone agrees with this fly shot. PETA says on its website that it is sending the Biden campaign a “humane trap” that can catch insects alive so they can be safely placed outside.

Wednesday’s event was the only scheduled vice presidential debate. Two more presidential debates are scheduled for October 15 and October 22, but U.S. President Donald Trump said Thursday that he refused to participate in the online presidential debate.