Not as cool as most of these, but when training out of Headcorn, we'd done one of our first sorties out of area, and had just switched back from Manston to Headcorn. My instructor wanted to demo a landing on the short unlicenced crosswind runway 21. So on contacting Headcorn I requested an approach for 21 and got my favourite ATC reply to date:
"Negative due llamas on the runway".
Not what you'd expect in the south-east of england, but then again flying from Headcorn nothing actually surprises you!