A few weeks ago I was on Lambourne bashing the stack down, holding was in the region of about 15 minutes. A Speedbird driver requested 1.5 minute legs which I approved.
When the time came to chuck him to Heathrow, without thinking I said-
"SpeedbirdXXX, report the length of your legs to Heathrow Director 119.725"
It took him a while to get the readback out whilst I sat there feeling like a numpty!
Some cheeky fella checked in shortly after with "ABC123 descending FL150, 32 inch inside leg"