What happens when a country summons an ambassador

Foreign Policy tells us here what it actually means when an ambassador gets summoned. Basically what happens is that the ambassador gets an earful, and the atmosphere chills as both sides iterate and reiterate the views of their respective countries over whatever the incident happens to be.

It would be nice to have a list compiled somewhere of a list of ambassador summonings by country, in order to see which countries use it the most frequently and on which country, and also the main reason for the summoning.

The most ridiculous summoning over the past year or so was probably Iran's summoning of the Italian ambassador in July over their "violent suppression of G-8 protesters", due to the "violent suppression of justice-seeking protesters by the Italian police".