What's a texture you won't touch even if you life depended on it?

Exaggeration, but you get the idea

For me it's probably mud. I don't mind dirt when it's completely dry, I actually used to play in dirt all the time as a kid, but once there's moisture I feel like I'll throw up. Especially when it gets under my nails. God I hate when anything gets under my nails and it being wet or moist is even worse