You know you've got big boobs when ....

[Jaro]

This is just for fun. Exaggerate and find a humorous way to end this sentence:
"You know you've got big boobs when ____ "

Example:
"You know you've got big boobs when you are always 5 minutes late but your nipples are on time"

 

[Dungeonmaster]

Let me get the obvious one out of the way here...
I
You know you've got big boobs when you constantly trip while walking.