Looks like Dave's. I tried their hottest once (reaper) and they said I'd need to sign a waiver. They forgot to make me sign it and it turned out it wasn't even that spicy anyway. The bun was kinda spongy and the chicken wasn't great either. Fries were good though.

I have heard from others that their reaper level is really hot and delicious. Maybe it's just the location I went to that was subpar.