“That's nothing! I've…” — a bragging contest with the present perfect.

Painting: Rosa Bonheur, Portrait of a Greyhound Dog, public domain, via Wikimedia Commons
The bragging contest: work in groups of four or five. Draw a topic. The first student brags about their results up to now. The next student must do better, and so on. The last student plays the greyhound: “I don't want to brag, but…” and tries to find a surprising twist!
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Student 1:I've seen four films this month.
Student 2:That's nothing! I've seen seven films since the beginning of the month.
Student 3:Well, I've been to the cinema ten times this month, and I've seen twelve films.
Student 4:I've done better than any of you: so far this month, I've seen twenty films!
Student 5:I don't want to brag, but I've seen fifty films this month… and I've never paid for a ticket!