11 Clear Signs Someone Is Flirting with You 2) He's Leaning, She responds. This sign was made famous in the movie "While You Were Sleeping." 3) The Let You Know They're Single. 4) Jokes and Pitch. 5) Compliments You. 6) They're Always Popping Up. 7) Questions & Conversation. 8) Attention is Only on You. 9) They Light Up When They See You.