I do this at work and now I can put a name to it :)

Its something I deploy to low-stakes instant messaging communications. So you might get a:

'Hey quick one can you help with <request>'.

I can see the request but defer acknowledgement.

If its low-stakes then I sometimes leave it for 15 minutes and then acknowledge it up and its amazing how many times I do that I get a:

'Ahh no prob, sorted it out'