kreyren

You can take a regular drinking glass (larger one ideally) and put it over the spider slowly and then "scoop" them with it. Once they are inside it the glass walls are too slippery for them to get out without building a web giving you plenty of time to go outside and shake them on e.g. the grass or throw them out the window. ^^ They have a small mass so fall from any reasonable height won't hurt them unless they are tarantula sized in which case you probably want a box and it's probably someone's pet that escaped as they aren't native to Czech republic that i know of and in that case you probably want to ask your neighbours to get it. O_o Though i usually put a piece of paper on top of the glass.. in case they can jump X_x .. though they never did for me so far as they can't build enough friction for that due to glass so for them it's like being on an icey lake :p .. also be careful to not scoop them with a web as that web might adhere to the upper edges of the glass allowing them to escape.