So, what's your biggest dummy moment??

Had my engine bay all base coat clear coat done, still had paper on the steering linkage as it was painted black and the bay was sublime. Welding floor pan in and caught the paper on fire took a few seconds before I noticed with welding hood on the firewall was in flames. Not a good moment! That was a Thursday night. I was so pissed at myself I stripped it Friday night primed it sat and repainted it Sunday.