I got this idea from the Victorian Flirting Thread.
It probably won't even make a second page.
The idea is this:
I provide the first line for a limerick, you make up the other 4 lines, then provide a new first line for a new limerick. (for those who don't know, a limerick consists of 5 lines. The 1st, 2nd, & 5th rhyme with each other and the 3rd & 4th rhyme with each other.)
Hint: end the first line with an easily rhymable word. The idea is to create limericks, not stump the other person
So my first line is:
There once was a boy from Scotland
Buy Whizzo butter and go to heaven!