don't look now

phrase3

1. •
   Used to alert the listener of danger, so that one may flee while the attacker thinks they are still unseen.
2. •
   (informal) Used before a statement to tell someone to be aware of something (often a person) without looking.

   • For mercy's sake, just look at that scarecrow there. Did you ever see such a fitting dress. Don't, don't look now; she'll think we're staring at her. — 1916
3. •
   (informal) Used to point out something the speaker feels is obvious.

   • Oh, yeah? Well, don't look now, but we're on the grass!