'it's Golf Balls'

Geoff entered the bus with both of his front pockets full of golf balls and sat down next to a beautiful (you guessed it) blonde. The puzzled blonde kept looking at Geoff and his bulging pockets.

Finally, after many such glances from her, Geoff said, 'It's golf balls'.

Nevertheless, the blonde continued to look at him for a very long time, deeply thinking about what he had said.

After several minutes, not being able to contain her curiosity any longer, she asked;

'Does it hurt as much as tennis elbow?'