Take me with you and I'll lead you anywhere. Flip me around and I'll annoy you.

Why this works

This riddle plays on the dual meanings and forms of the word "maps." When you take a map with you, it literally guides you to your desired destination, fulfilling the first part of the riddle. However, when you flip the letters around, you get "spam," which is often associated with annoying unwanted emails or messages—hence, it annoys you. This clever wordplay makes "maps" the perfect answer!