They were strolling through a lush jungle on a nearby planet, when the Doctor suddenly stopped.
'Oi watch it Spaceman!' Donna cried as she walked right into him.
'Sorry' he muttered.
'Good. What are you doing?!'
The Doctor reached up and grabbed two blue leaves of a tall tree close by.
'Oh brilliant! I haven't had this in years!' he cooed, handing one to Donna.
'You haven't had leaves? What are you saying? Time Lords eat leaves?'
'No. Donna, this is bubble-gum!' he exclaimed happily, popping a leaf in his mouth. Donna looked at the Doctor, who was now blowing giant bubbles happily, then down at the leaf in her hands.
Then she felt something sticky in her hair.
'Are you kidding Time Boy!? You just got gum in my hair!' she bellowed. The Doctor shrugged, and blew another bubble. Then it happened.
'Pay. Back' Donna muttered, now laughing at the Doctor with blue bubble-gum stuck on his now pouting face and in his gelled up hair.
