Good one!!

Grandpa and Grandma always got very excited when they recalled the old days they were together. They made a decision, one day to make it "yesterday once more". They made a date on the river bank they used to go when they were young. The next day, grandpa got up 6a.m. in the morning,dashed to the bank, picked up a big bunch of wild flowers before sunrise, waited there for his sweetheart to come. But grandpa ended in disappointment grandma never showed up even after sunset. Grandpa went home in such an anger. He opened the door, seeing grandma lying on the sofa with her pillow. He threw the flowers on the floor and questioned:
"Why didn't you come to our date?!!"

Grandma hid her head in the pillow and replied shyly:
"Mom didn't allow me to go..."