Do you think that she is pretending to be ill?

Somebody passed this joke to me. Any resemblence to a recent event is entirely co-incidental.

A worker asked the supervisor for the afternoon off, as he has to see his grandmother who is ill.

The supervisor said, "It appears that, whenever there is a soccer match, your grandmother becomes ill?"

The worker replied, "Do you think, maybe, that my grandmother is pretending to be ill?"