Something that has bothered me since 2004

I still watch Viva La Bam, WildBoyz, Jackass an unhealthy amount in the year 2024. Everytime I come across this episode, I have a huge issue with what Knoxville says after he bashes Bams’ classic hummer’s window. To my old ears, he says “That’s really going to smart.” Which makes zero sense to me. Someone please enlighten me.