No Bumping the Table

I came home one day at lunch to find Lea and Dan building block towers. This sign was on the table:

"No bumping the table !"

(the triangle and circle are an interpretation of the exclamation mark showed her)

Apparently Dan had bumped the table and knocked down her tower enough times that she felt she needed a sign to impress upon him that bumping was not allowed. He told her what letters to write and she wrote the sign.

I hear tower building went much better after the sign was posted.