Well .. I'm not much of a math person ... but I read this on a bathroom stall at a rest stop between Kentucky and Tennessee in fourth grade - and it's still good! Plus I'm sure of the math.

2 lovers
+ 2 gether
---------------
4-ever

I read some other things that I won't share. But there are a lot of cheatin' boyfriends and little daVincis with magic markers out there! I'm just saying. :-)