Three ducklings all showed up to class late there first day of high school.

The first duck showed up 5 minutes late to class.
The teacher asks, " Why were you late?"
She says out of breathe, "sorry i was blowing bubbles."

The second duck showed up 10 minutes late to class.
The teacher asks, "Why are you late young lady?"
She says, "sorry i was blowing bubbles."

The third duck shows up 15 minutes late to class.
The teacher asks, "Whats your reason for being late?"
She says, "sorry teacher i was blowing bubbles."

30 minutes later another student walks in late.
The teacher now mad asks, " Why are you late? Never mind let me guess you were blowing bubbles?"
The duck says, " No teacher, I am Bubbles."