The mud was thick and glutinous, sucking at their feet as they walked. Donna was far from impressed.
“A pleasant stroll, that’s what you told me, Spaceman! A chance to stretch our legs and breathe fresh air!” She sniffed cautiously. “There’s nothing fresh about this air; smells like something died! As for that whole pleasant stroll, feels like I’m wadin’ through treacle. You got any idea what this is doing to my boots?”
“Bit of mud never hurt anyone, Donna! Where’s your sense of adventure?”
Moments later, the Doctor changed his tune.
“Rotten mud! It’s eaten one of my sneakers!”