Once over heard on a visit to approach....
ATC: "Peckerhead 69 (heavy) you are on a nine mile final at 5000, can you make it in from there or do you require extra track miles?"
Pilot: "AFFIRM, we can make it"
ATC: "Cleared visual approach straight in runway 29"
ATC: "Peckerhead 69 you are now 5 miles and 3000 can you still make it in from there?"
Pilot: "AFFIRM"
A short pause, then...
Pilot: "Err, ATC doesn't look like we can make it in from here!"
ATC: "Turn right zero, nine, zero" (releases PTT) "for NO apparent reason"...
Offending aircraft then taken to a 15 mile final! Still makes me smile...