khun "used to love physics" tries this,
1. do a "jeeeb+" (in thai classical dance)
your thumb and index figer now touch each other
2. then open them, leave a small space between those fingers (about 1.5 cm)
3. what kind of fruit(?) could you think of from these gesture ja~??? haew~ ja haew~

jeeb+ mai' tid

(I read it from a teenage magazine a while ago ^_^ )