WHAT trick does Oberon play on Titania?

Oberon has Puck sray love juice on Titania. The first thing she sees is Bottom with an ass head: she falls madly in love with him.

Oberon plays a trick on Titania by adding the juice from the flower of love in idleness. which caused titania to fell in love with the ass headed clown. oberon did not think twice that how ashamed titaina would be once she is out the love charm