A few days ago I got a sore throat. Hence, I went to the pharmacy where I usually go, next to my place, and I asked for some throat drops.
The guy there, who has known me for a while, greets me good morning and sets off to get them. He comes back, lays them on the counter and says categorically: "You're gonna suck 2 times a day, ok?" Of course, the minute he said this my eyebrow must have lifted with a surprised expression and I got stuck with that face people get when you're having trouble not bursting out laughing but you must keep a straight face.
On the other hand, a light bulb went off on his head right after the words came out of his mouth and he looked amusingly distressed.
Me, proud owner of a rather distasteful humor, returned: "Starting now?"

And that's how you manage to never be able to set foot on a place again.