This is just a jumping off point. Keep 'em comin'.
  1. Breaking into somewhere after hours
  2. Halloween party meet-cutes
  3. Changing room montages
  4. Farcical cases of mistaken identity
  5. Girl being a klutz because she needs a flaw
  6. Girl finding out her love interest was just writing an article about her the whole time
  7. Girl finding out she's a bet
  8. Girl having a cartoonish dickhead of a boyfriend
  9. The "frumpy" girl who was right in front of him all along
  10. General emphasis on male romantic fulfillment
  11. Prom climax
    Suggested by @tothemaxxx
  12. Guys asking each other for girl advice while playing basketball
    Suggested by @emjuko
  13. Adults receiving wise love advice from precocious children.
    Suggested by @nora
  14. The eye-roll "let me GUESS" listing of other character's life details that they would have no possible way of knowing. "You drive a BMW but you're too cheap to get that mirror fixed. You don't floss but say you do. You treat women like tissues so no one can get as close as she did." *adjusts overalls* *moment of soft regret* *exeunt*
    Suggested by @thebfg
  15. The sassy black/gay/fat best friend who you see kissing/dancing/holding hand with someone at the end when the camera pans over everyone at the dance/party/gathering to show "hey we didn't forget about him/her either!"
    Suggested by @eatthelove
  16. Someone gets locked out without their clothes and has scramble to find cover - hope the love interest doesn't see them!
    Suggested by @alibaron
  17. When a crucial part of the story involves "making over" the girl so that now she's hot and deserves love/acknowledgement/human rights.
    Suggested by @HeatherQuinn
  18. Someone "just dropping by" someone's house at THE opportune moment to move the story forward.
    Literally no one just shows up at someone's house anymore.
    Suggested by @sam
  19. "That hobby you saw me lovingly doing at the beginning of the movie? It's my small business now."
    Suggested by @angusisley
  20. the old run-though-the-airport-before-his/her-flight-takes-off, which could never happen in a post 9/11 romcom.
    Suggested by @lindsaygelfand