Three friends boarded a house-full bus. some how they sneaked their way in the centre of the bus. They stopped besides a seat which was occupied by three girls.

The girls offered them seat on one condition..that they (the girls) will sit on their (men) laps after having given up the seat. The men agreed to the condition and had the seat and the girls on their lap as well.

After some time one girl said to the man on whose lap she was sitting, "Are you an electrical engineer?". The man was surprised and replied "yes but how did you know that."

The girl replied "I am receiving shocks from your solder gun".

After some time another girl asked to the man on whose lap she was sitting, "Are you a mechanical engineer." The man was also surprised and replied "yes but how did you know that."

On that the girl replied "your piston is hurting my cylinder."

After some time the third girl asked her man if he was a civil engineer. The man was also surprised and asked her how she knew that.

The third girl replied "Your dam has broken and flooded my village."