"Raisin Bread" joke

A general store owner hires a young female clerk with a penchant for very short
skirts. One day a young man enters the store, glances at the clerk, and glances
at the loaves of bread behind the counter. "I'd like some raisin bread, please,"
the man says politely.
The clerk nods and climbs up a ladder to reach the raisin bread located on the
very top shelf. The man, standing almost directly beneath her, is provided with
an excellent view. As the clerk retrieves the bread, a small group of male
customers gather around the young man, looking in the same direction.
Pretty soon each person is asking for raisin bread, just to see the clerk climb
up and down.
After a few trips the clerk is tired and irritated. She stops and fumes at the
top of the ladder, glaring at the men standing below. She notices an elderly man
standing amongst the throng. "Is yours raisin too?" the clerk yells testily.
"No," croaks the feeble old man, "But it's startin' to twitch."