FIVE RIDDLES

1)
I always follow my brother,
Though very different we are.
You can see him, but not me.
You can hear me, but not him.
Who are we?

2)
Yellow I am
And massive I weigh;
I come in the morning
To brighten mother's day.
What am I?

3. What did Otto Klemperer say to Omar Khayyam?

4. What fish likes to flirt?

5. What did the fish seller say to the indecisive customer?

 Answers:

1. Thunder and lightning
2. School bus 
3. "I'm OK. You're OK." 
4. Koi 
5. "Pick a cod, any cod."