A flu shot per vagina, perhaps?
No CUT that out, you are making my imagination run riot with such a suggestion.
As a now retired nurse who worked many, many a shift in E.R. I can honestly state that I have assisted in the "retrieval" and removal of many strange and mysterious objects, etc, that equally mysteriously (????) found their way in to vaginas.
And, fyi, Ping-pong /table tennis balls being the least strange of them all, though most difficult for the female patient to explain was as HOW a gear shift with an 8 balls from a Pool set managed to find its way into the bodily orifice in the first place.
And we will not discuss a certain and very regular male attendee at the E.R. who had numerous visits with all kinds of hollow and not so hollow objects attached firmly to his male part, except to mention that we ended up giving him the very dubious nickname " Chook F***er after one particular and nauseating visit of his.