The University of Alberta increased email subscribers by 500% with one well-timed, well-worded popup. It waited until someone had spent more than 10 seconds on the site, then asked: "You seem interested in UAlberta news. Would you like to sign up for the Daily News email?" Two things made it work. The 10-second delay meant it only showed to people who'd shown genuine interest, not everyone who landed and bounced. And the wording acknowledged what the person was already doing ("you seem interested in…"), so it felt like a natural offer instead of an interruption. Most popups fail because they fire instantly and shout the same thing at everyone. A popup that waits for a signal of interest, then references that interest, converts on a different level. If you run a popup, when does it fire, and does its wording acknowledge what the visitor's actually there for?