Re-write a TVC - exchange scripts!!
Here is an interesting prompt Take any ad commercial say for e.g Maggi sauces 'Tamarind 'Sauce with Javed Jafferey the tamarind pichkoo sauce and use the script or the lines spoken for an Insurance Ad. See that it is humorous, yet makes sense! or choose any English/language commercial on your favourite channel and complete this prompt! This prompt helps you observe a commercial's dialogues and when you change it to suit another product/service - you are in fact learning to write a commercial. Good Luck. Hope you have fun!