Best so far was.....
XXX034, you are cleared to intercept LOC 25L, at your discretion break off, follow the Lear Jet, runway 19L, do not join final below 4,000 QNH, you have helicopter traffic below you on final, clear land 19L.
The F/O looked at me with eyes like dinner plates - he had not been to Vegas before
I wish I had been in the helicopter as we turned final, it would have looked stunning - Big Bus, fully configed, 30 degree bank, about 1/2 mile and 600' away.