We place a locked cage onto a given point in the desert. After that we introduce the following logical system:
Axiom 1: The set of lions in the Sahara is not empty. Axiom 2: If there exists a lion in the Sahara, then there exists a lion in the cage. Procedure: If P is a theorem, and if the following is holds: “P implies Q”, then Q is a theorem. Theorem 1: There exists a lion in the cage.
The geometrical inversion method
We place a spherical cage in the desert, enter it and lock it from inside. We then performe an inversion with respect to the cage. Then the lion is inside the cage, and we are outside.
The projective geometry method
Without loss of generality, we can view the desert as a plane surface. We project the surface onto a line and afterwards the line onto an interiour point of the cage. Thereby the lion is mapped onto that same point.
The Bolzano-Weierstraß method
Divide the desert by a line running from north to south. The lion is then either in the eastern or in the western part. Let’s assume it is in the eastern part. Divide this part by a line running from east to west. The lion is either in the northern or in the southern part. Let’s assume it is in the northern part. We can continue this process arbitrarily and thereby constructing with each step an increasingly narrow fence around the selected area. The diameter of the chosen partitions converges to zero so that the lion is caged into a fence of arbitrarily small diameter.
The set theoretical method
We observe that the desert is a separable space. It therefore contains an enumerable dense set of points which constitutes a sequence with the lion as its limit. We silently approach the lion in this sequence, carrying the proper equipment with us.
The Peano method
In the usual way construct a curve containing every point in the desert. It has been proven  that such a curve can be traversed in arbitrarily short time. Now we traverse the curve, carrying a spear, in a time less than what it takes the lion to move a distance equal to its own length.
A topological method
We observe that the lion possesses the topological gender of a torus. We embed the desert in a four dimensional space. Then it is possible to apply a deformation  of such a kind that the lion when returning to the three dimensional space is all tied up in itself. It is then completely helpless.
I genitori sono una brutta razza: per difendere il proprio cucciolo farebbero di tutto: controllare le sue amicizie, spiarlo, renderlo socialmente inetto, investirlo (del resto accompagnarlo a scuola coi mezzi è troppo, troppo pericoloso), origliare le sue telefonate, leggere le sue mail… Con la giustificazione “sono la mamma/il papà, ho diritto di fare quel che credo per il meglio di mio figlio”.
Quando però è il figlio stesso a essere una carogna o sono i figli altrui quelli “in pericolo” menefreghismo se non incentivi ulteriori. Quanto spero di non diventare un padre simile…