Dear reader, I was that clueless stude...
One of my early trips on the TWU course at Chiv, thumb in bum, mind in neutral, taxying out too close to the aircraft ahead.
Voice from the back seat (clearly trying to get idiot Bloggs to use the gunsight to work out the range): "So, Bloggs, what's the minimum spacing on taxy?"
Me: "Hundredandfiftyyards." (Chest swelling at my own cleverness)
Voice: "So how do you judge 150 yards, Bloggs?"
Me (without thinking): "Ooh, it's about a well-struck 7 iron."
Cue a string of deleted expletives from the back seat.