When is the joke?

Ten jokes: I just turned off my phone on the plane and asked the old lady next to me what time it was.

I just turned off my phone on the plane and asked my grandmother what time it was. After asking three times, she said, "I can't tell you."

I asked why!

Grandma said that if I told you, you should thank me. If you thank me, I have to talk to you; I am familiar with it. You must help me with my luggage. If you help me with my luggage, I will invite you to my house for dinner. What if my granddaughter sees you falling in love with you and you can't even afford a watch ... so I can't tell you the time. ...