Examples:

• I'm just gonna say she is, When did this happen?
• When did this happen, the orange juice and the not talking?
• When did this happen? A month ago, a couple of months
• When did this happen to Zaheer?
• And you said this was... This was... When did this happen?
• When did this happen with McArthur?
• When did this happen, this conversation?
• When did this happen? My old boyfriend Bob surprised me.
• I'm so sorry. When did this happen?
• When did this happen, Stan?